Malicious PDF — malware analysis report

Static analysis result for SHA-256 787c7521cb8dabbd…

MALICIOUS

PDF

84.6 KB Created: 2021-06-28 13:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fe99cf1fcb0fc2e38cbca19365a5e96a SHA-1: 1f442dcca2d48deb3c74ea589d8a25196d1b47f1 SHA-256: 787c7521cb8dabbd955e5ed3eacc4310f575f1ab8525d81820bafb1195f88dc6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, indicated by the presence of numerous external URLs, many pointing to compromised CMS upload directories. The 'SE_DOWNLOAD_BUTTON' heuristic suggests a visual element intended to trick users into downloading further content. ClamAV detection and ML classification strongly support its malicious nature, likely serving as a dropper for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=food+timetable+template PDF link annotation
    • http://www.cddfct.com/up_files/file/30452018204.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8afa4c2a2---54879654822.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/dekamefasoxinipano.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/56e49310c26be25d8f25a5a3d48ea631/96007615889.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6b2524891a8dd6000b1aff56983ff78a/tozafukirivarojogenepipej.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/rolisinozonomibisekedijis.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/11963396413.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/komixujinoxeri.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a525faeffd---74898716181.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c92bc75fdb---solefefoxewuxepujaxivoxe.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160898dca8504c---zorileselefadusunudujava.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840e69e88a1---22695084771.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/zamogewapupemow.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9f7a11988171fa03a06c6690c5a784ef/jorunewavisuzigapeto.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bec5cad40e3---93671161040.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b618a83452---gadabaz.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vjrt01qalfd7c59jb60dieu027/75046793726.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210613_74c65.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bfe7c048---95688472510.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bc4968530---jujeruxiruwuze.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/rm8sf3lq68k3c5nb252pt44e73/45846122901.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b1bb1513dd837a68953afcae50556ddb/govazitibamawogoxeraluv.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/36960568241.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/joparegusetobamukun.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/987cc27be09719d7e1fc9e8bcdec68d2/89359998858.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9D 16728 bytes
SHA-256: 38bb24a14c7dd6beaf3692976a7a78e40e465a2b06c27db0412f1f6e6513c2c4
font_01_sfnt_off0001163a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E51 10296 bytes
SHA-256: d3cb6d3ddf3a049c84543ffb27154dd1f9c6ce44f3fa3be40502a06803a95417