Malicious PDF — malware analysis report

Static analysis result for SHA-256 6679aaff175f70d4…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 23:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 73cef3af1d08639a609fd29529af379c SHA-1: 4f30eee9e12f4760be69c64bce22faa610810630 SHA-256: 6679aaff175f70d4a45a64dbfff313e87c6a3926150ea2c56eb4c3b9ccfd185e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits multiple indicators of malicious activity, including links to algorithmically generated URLs and a link farm hosted on compromised WordPress sites and disposable domains. The presence of a visual download button further suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a likely attempt to download a second-stage payload, potentially leveraging embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=cortana+apk+download+for+pc PDF link annotation
    • https://flavio-tonon.it/public/file/78687118141.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/varire.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/66309960650.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/zamemenifazivujasukekex.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/45933877347.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161332eb83d619---rebas.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/3089548778.pdfIn PDF document text
    • http://recviem.ru/img/upload/60572097558.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210912064728.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/66241202198.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/16830084966.pdfIn PDF document text
    • http://elsped.hu/files/file/zesijopos.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370ab2198b6---67247780721.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/linadobexafuxur.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/rivirosafibodokogot.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///88255402573.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/76876912025.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/luwodedun.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/meperewitikezezabeki.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/motuvoxarapelawe.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/konevamifamekewazirinir.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413a2d97dd9---sanixoxare.pdfIn PDF document text
    • http://carbonelite.ru/file/bowowiwerekisefokoba.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_off0000dc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 10428 bytes
SHA-256: 0a2a98a8310543569e5f144e7c13cb8653b14c726551c837b6cbcf6d70f507a5
font_02_sfnt_off00010c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 18560 bytes
SHA-256: a3824efff4031a2628f315d3ebab325d71caa15eec1ec05c7b98a7e9e1513985

Open this report in the interactive analyzer, or submit your own file for analysis.