Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f7df2f97272677…

MALICIOUS

PDF

80.6 KB Created: 2021-06-20 11:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ff3a3b5e45bff5cafd87144ed6b07e2c SHA-1: 4d0297a987fe00eee68084ec0d8bfd7861521b69 SHA-256: 26f7df2f9727267734fed34370bf5b22a99f9082227e9821286c28ccacd6895d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely to distribute a secondary payload. The presence of a download button lure further supports the phishing and malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d20b580586---farolelubekijesoro.pdf In PDF document text
    • http://matchedtubes.de/userfiles/file/36805702359.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/fd96971a9d7c06d4542f1019a726acec/83892906368.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/debitajaraxotawa.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090257cbf09b---12790017094.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/7fe80810c4640cd54831d89ac88e7f0b/56352017718.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd8b0cae97---fojavasikil.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/9401799813.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/92300026285.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984261badb4---rajepudixasemilesuz.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdcd4da4ef---mopifuzufozal.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2abe342e2b7324af89e138a9bd6033a1/fevogagobewu.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c32b2c380d2---83687789804.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/gakasuwipeloposuritix.pdfIn PDF document text
    • https://aedwea.com/upload/foto/68812059643.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fb784bb38---50664420844.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781fd2ac72b---25203833613.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=asphalt+8+airborne+cheat+codes+for+pcPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/451463946fca2439203907f17ee003a5/kogulivoruge.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 5564 bytes
SHA-256: bc1bbfa902b0662f7a18f9a27c67a97e12be051fd53ea6f6aefc394ad6c5d212
font_01_sfnt_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 2316 bytes
SHA-256: 5b91c186c0d2506cbb1932d417fe2e40edf424c68f696d43443a27f8f7fee313
font_02_sfnt_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 11400 bytes
SHA-256: 6f5eb170bddfc3aa279a8eea8d00f4cb7468f69d02477915776e4c1f65e057a8
font_03_sfnt_off0001202c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202C 16028 bytes
SHA-256: ced8b21f0c91c47eb2a8e10a251844195ecd6fd413d2ce9a64032c85f057f195

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