Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73d97b75b55c13a…

MALICIOUS

PDF

88.6 KB Created: 2021-09-03 21:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69627154eb8922a7cb0ab686d332bf14 SHA-1: 9ea33db38b656d75847b25a3d167f57cb009f2bb SHA-256: e73d97b75b55c13a71ace2db270ad06d2dd9722ccba4f2d2f8730a819c6153a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://technok.cz/wp-content/plugins/super-forms/uploads/php/files/e8af9d137602a0796db8388b0dd3142c/xorotenepokijezopumuto.pdf In PDF document text
    • http://afgventuregroup.com/cfiles/file/texuzi.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/2acb45f02a7513549dd56f3f2ee388db/moxoviwu.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210727055542.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/0f746f6ee67ec36cc5f923217c04e3af/70108850856.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d485da32f---pakamedujibejilit.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54168cbd84---89848754064.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8343af3c8f---lajaligunojanil.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/7655236935.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/dekego.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/waverufu.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///titenunudipatexas.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/38944421048.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b010661e08---26763856294.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160750c9862b83---36538930851.pdfIn PDF document text
    • http://altinay-law.com/images/file/1936610706.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/wolusomej.pdfIn PDF document text
    • https://stvorki.ru/files/file/67990507735.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/qa4lm2v5tgun68fvvfo8ndvkjp/zetigadev.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/46374688732.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/poposuka.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/fenogelu.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/woparifofefigivut.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/gopasipunoganege.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a01d218dff9e5cab03f9850724bdac93/kikufapifura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=kitchenaid+toaster+oven+model+kc02220b+manualPDF link annotation
    • 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_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4C 11268 bytes
SHA-256: 22dbdc51a66854d0dbd6baae7aeb68ef786a5cbce7919e9e6e12cf93b6b2ba8b
font_02_sfnt_off00012697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12697 17800 bytes
SHA-256: e152be7a3def4a2d7dbc887405bb0f874ac83992e78a8106da5f964ed0e0ea10

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