Malicious PDF — malware analysis report

Static analysis result for SHA-256 af042d66525500da…

MALICIOUS

PDF

70.4 KB Created: 2021-09-02 01:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0b33fe8e4af314d765319c90e88b157d SHA-1: d198a3036ff1424489f1cc0413d5b1633b942011 SHA-256: af042d66525500dae524b9a7127ec2f3bdc01d22d2bbd97fa66ffe55c9da01cd
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PRC/3D content and ML classification further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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.
  • 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://philabc.ru/uplcv?utm_term=different+stages+of+cell+division PDF link annotation
    • http://onlinecommerce.bg/uploads/pages/files/gaxusazijopoxaba.pdfIn PDF document text
    • https://penal-garazh.ru/files/94070106773.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa75a85134c---sibasolif.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/46926271324.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/85486139886.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/55455394191.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16086d5d6ecf02---xojeku.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/31126391012.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d5a16e1c57ce8d309cb2f241de5e1896/94199298275.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/3a0aaf34172cdcc6fafa751ed1452424/luwikerofexum.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fc0dc47c---luvifodifufu.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210705155933.pdfIn PDF document text
    • http://atrsara.ir/resource/files/1305136201.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/ninapabebivobiganiket.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/49983540911.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/91077896551.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160985ab0d2529---80855065613.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/sotolapu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c9dffd5eb4---gunefenuvalifafuw.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/bisalurixudomuvosoreg.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/medemasaf.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_off0000b341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB341 15640 bytes
SHA-256: a1e631919c7e8de72b7e632b1155cd23b4b3a2d0d8d72b5c5b97af6d9ccd0378
font_01_sfnt_off0000db7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 10716 bytes
SHA-256: 373486b273118bb3b41f39cd4c6d860fc79f17b112dfda84a6fee95db3e63b20

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