Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac4ace4a42a3817…

MALICIOUS

PDF

87.8 KB Created: 2021-09-01 05:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04596a30b0b2b122889a5fd764690c27 SHA-1: daf76b6e99451838baf5c06f3235d477f9352589 SHA-256: 1ac4ace4a42a3817eca4d03cecb7265e62b676c14a27345f202e66e96ca7979a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is intended to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • 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://smidgel.ru/uplcv?utm_term=check+monitor+refresh+rate PDF link annotation
    • http://robalton.es/Albums/images/file///pezifetobexidutaxodinazul.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/53712487817.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/32317646022.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/mapuxibabuvazupugipiba.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/52359113172.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/79b028d8762dc2530989a72ddc9ff343/15877444464.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/24709093275.pdfIn PDF document text
    • https://area5srl.it/file/24484785522.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/lasivituxalivu.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/49uqk8hfqpia61l2s7nbvcf5a3/dadigu.pdfIn PDF document text
    • http://huntland.hu/upload/file/rixorexudebukosatamo.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/61679755225.pdfIn PDF document text
    • https://limsurdua.com/contents//files/6328394400.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/84230566754.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/71051516995.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de3acf46f51---40205023768.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/33501606635.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021512057245232.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/lonezawujigewotol.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuluroxugumedagarovofamov.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b5aadc421---sepopesojuravakijaj.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4deeb603fa826cc6e2fd8176a3c10130/74007938788.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/pifewejuseragun.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/zaxodivurodebaviji.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/57683577149.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/96785419574.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_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 17172 bytes
SHA-256: 683c286a816b0426e1027ef48675e29a7d636b781bb3abeb813fe1661afb0036
font_01_sfnt_off00012035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12035 10680 bytes
SHA-256: 703004203d2a9b457b86a771049c4d09777ad674f9686140f379bfaeffcdf68a
font_02_sfnt_off00013890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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