Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15db3d77c471d6a…

MALICIOUS

PDF

87.6 KB Created: 2021-07-08 17:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 696c6ce95a388839f27a47584f144126 SHA-1: f30611d36e2d864a3d74085aaea0ce1a0421e04e SHA-256: c15db3d77c471d6abfa952622c2aec05b880535fab7c6a7f71f667001a26577c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting it's used for phishing or distributing further malware. The PDF structure and embedded links are consistent with a malicious document designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/je6fe9put9unm32e0nqb75qo42/86330155972.pdf
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/nulimemilumisevevosizap.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f89d1d4d749a2278e5e6d8b49bc820d8/wowitejotomovodebiseni.pdf
    • http://gtshotel.it/images/file/piwavagutuvuboradabuga.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb6af1b8fd---32833114034.pdf
    • https://melz-feu.ru/upload/67502388623.pdf
    • https://ustunbilgisayar.com/userfiles/files/bepaxuxovewe.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc014b961---50590040512.pdf
    • http://belst.by/upload/file/57415081830.pdf
    • http://ipost.mn/ckfinder/userfiles/files/mumarovak.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d6a255ba---32664309046.pdf
    • http://afghansolar.com/userfiles/file/57930967327.pdf
    • http://mitcostruttori.it/userfiles/files/zuwife.pdf
    • http://tofuyatogo.com/uploads/files/12225502182.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/be8f7e86c857f002dba1da48e5eaccf7/rorutetukunano.pdf
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/oe7h2fet4n5v498uhrknqjqa1g/70936240060.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb16b874a---mijawotiroluwurebipef.pdf
    • https://boyanbolyarski.com/userfiles/file/gonokemojevifo.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/39981662453.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/bdgcbefgo6kcif4mi852slgn8a/21084929786.pdf
    • http://ahkjt.com/upfile/file/64523281696.pdf
    • http://hzqzg.com/d/files/welatesodoxafo.pdf
    • https://nanyangtextile.com/userfiles/file/97729985271.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=baby+not+burping+after+feeding
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f097.bin
507d3636e984402c8b6c414f095e851f6947de2a9a51f247b1fca7456fa730e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 10864 bytes
font_01_sfnt_off00010971.bin
b4d599e11dba8262b028ee133d5be37983bf861a7999cc465f43c2b7347ffeb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10971 17464 bytes
font_02_sfnt_off0001373e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1373E 16792 bytes