Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30f604bf7ac9d17…

MALICIOUS

PDF

81.8 KB Created: 2021-08-24 13:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f163391527e9d6b2a56d502628cbb9d2 SHA-1: 27b87f5697121eb1e0b1d148818c35ccee3ad85d SHA-256: f30f604bf7ac9d17275f3373a4acfd03bee293fbb1634287324ebb59f262b81e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including links to compromised WordPress sites and disposable hosting, suggests it's designed to deliver a payload or redirect users to malicious content. The heuristic 'SE_DOWNLOAD_BUTTON' further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=linux+display+open+ports PDF link annotation
    • http://syuncyoku.jp/upload/file/22955830406.pdfIn PDF document text
    • https://mytopics.it/uploads/file/53049968629.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5eb88b17f---14044259344.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/92320637443.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d490c1f234a---vixepozu.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dad926c9a6---vufatinelanoworofexagev.pdfIn PDF document text
    • http://cl-pub.com/files/files/vuvugadeko.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/muxuvuditek.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/pufat.pdfIn PDF document text
    • https://12shio1.com/contents//files/kevelolipozorob.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/69390023629.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161167cd92cee1---bujibobutolewinu.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/vetepolutid.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/24828142987.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2c0d11a77---79287421222.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3gi10c81v9irkmsmecb9g59jj1/72299412134.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/lidaloxu.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/88153462802.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/leliloxulazezaxevadezeti.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210619_88DA7208667C755B.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a8205acee95---genaxaput.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/26687400204.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/ximofejalavu.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/7164520.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/mizugafogovus.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_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 16696 bytes
SHA-256: d9ce187ff7d82c3cc61fa4a5720c50d71613d86a145ebf06b37537ce3df5b63e
font_01_sfnt_off00010822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10822 10656 bytes
SHA-256: 99728d9986afa9dcc65c530f1e57b61f37a0659c6b69d8d5ae84f6fbc9756c7b
font_02_sfnt_off000120ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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