Malicious PDF — malware analysis report

Static analysis result for SHA-256 57de74f53f5c5158…

MALICIOUS

PDF

164.5 KB Created: 2021-06-24 01:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 4d005f58b1fbe4aa141253e7f52323a4 SHA-1: 14d80c8610314908be3cb6b506b4c4ac9802c137 SHA-256: 57de74f53f5c51584d1130358e364834ea17894906756e912d9869dfbffd8b4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/5b0c0e86730b08dadafaac8b8410c3d1/42752225383.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a08a278b020---32547447676.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/lietrcuc2pui8714n32ns09kl2/71151836517.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/neritafejigilevesiwiv.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/3b2d74453cc61a8ae10fc21c78283a0b/fibakipa.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80e1e1a430---dalupabunaxiwekokilij.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c78a53f5---25473567353.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3ec2d4ab2---48028348731.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021060911043173499.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210514053642_azsfjv.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/93806525598.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6aa91c8069d0015217cbb131221f463/masuvagutit.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/17301105469.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/finoguze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=crop+science+textbook+pdfPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/vekazurebogigarupog.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_off000208ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208ED 9008 bytes
SHA-256: 93b2e21f4ac31c5719bb2743b79d33d34e08b192fdb25accd34b315a58f92da9
font_01_sfnt_off000225fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x225FB 5084 bytes
SHA-256: a7fe8ffea7933dd360b0718bf151a1704bbcebd8e3d94204619a9c324cc650ff
font_02_sfnt_off00023757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23757 18072 bytes
SHA-256: 607ac2b191f9b41d2015be675b1ff86de3beeb6c852a532fa42a5c23816d6ac6
font_03_sfnt_off00026ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26EA0 16060 bytes
SHA-256: 503f5200e83b189a546b6c6e1d808633a9135186956fe76ff9bd78de3d91e3c6