Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cde879f3257706c…

MALICIOUS

PDF

109.5 KB Created: 2021-08-17 16:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5c2d3dc342602dcf465c7d329f9ea078 SHA-1: c773db50b82b94d0d58d566dc2acdcb8713fa7aa SHA-256: 8cde879f3257706ceba2ec6528b7dbc771b1796ea140987acdb3f10401ef39a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to distribute malicious files. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document's purpose is to host and distribute malware via these compromised URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b43001cdeba---60863664806.pdf In PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077232aede76---35733301496.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/7239532473.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/noxijowedumofitikifada.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/24664659435.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba9e69db97---54130803557.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/47986908252.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/laresosag.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/litetojodo.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d34341d77---nopimajikijufu.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/zikiruzovoxunikimu.pdfIn PDF document text
    • http://delve-cr.com/uploads/kisinula.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/gurolotapedimutog.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd45795fb6d---29750121189.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0377437df7ef7994261e6767ab64c4de/kizizokezebadok.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9f5446252---64273812883.pdfIn PDF document text
    • http://1976ahhs.com/clients/32223/File/74830284886.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210811_45D1307E732D8E4B.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/nobovopirumedafokujopo.pdfIn PDF document text
    • http://praguetransfer.com/files/file/32048676688.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/sadilumapovemisek.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/99480a51090e1e898e538f071af734b3/66588502516.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a16199044---43988390500.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b69bc2f5d---33832522104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=descargar+driver+booster+full+2020+activadoPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f5daed386---busowezidiseboxevogovu.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_off00013cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000154da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154DA 21728 bytes
SHA-256: 24148d69759bd67e7de414c87f8aefc17b2ea513a8900503d058b143e3b5db09
font_02_sfnt_off00018b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B16 11096 bytes
SHA-256: 97e4fcd4d400bd8e13af4f4417982076d9136cbe0ce7111c676ff7d88a63db1b