Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b539d2eaf3e614…

MALICIOUS

PDF

83.5 KB Created: 2021-07-01 23:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 29302d822813587f8f0e496d6e665203 SHA-1: 792b539b80b23ac3819c2f29665d65665e90e791 SHA-256: 92b539d2eaf3e614cd949b8f621ad1d4fb9130e858777aee247c49ba289f7757
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://archism.ru/uplcv?utm_term=how+to+get+repeaters+dauntless PDF link annotation
    • http://massimoandyuethui.com/clients/69227/File/fajijoxabefeduzozijolaz.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/66f5367793a46bfcb9676ac554cd7571/fadinobob.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/91853788934.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd0e19025d---34863384225.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/41577824431.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/87297568603.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f227a2edc---molusalowelafimov.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/xitola.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/n4uu05ke05keq892v9rp09q11d/5937427818.pdfIn PDF document text
    • http://www.meditt.com/wp-content/plugins/super-forms/uploads/php/files/54vhstu8363o2m1ifcpi8t8i39/xefokitimiwemo.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/74363075613.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2add153ca5d7ea5b30a3b1eeb68d1b3/jopujomenuwewepon.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/rvls9p9mturt5bq7s9rlur54rd/53741918948.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/4n3g194egk9na67b7dvtbt7baf/268062693.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/623d0bded63834688ab3cda67c32db13/pijamu.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210611132443.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/81056238391.pdfIn PDF document text
    • http://prosquash.by/data/72955297204.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16071d94c4134a---pidev.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/08c97e536b20baed33fccadb4264af70/mapenebodexunajo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddb1deb87f---nasapif.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/rekub.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/pepijazuzob.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_off0000e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 10652 bytes
SHA-256: 68b27c66642950542ab8bd972e43be8de6ca4fed722f54ebb72a52a7a0989648
font_01_sfnt_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 16788 bytes
SHA-256: a1121da55f3ea1c1937642f4d305eb916fabb0d4ceb0ecc3a2a2cc0aa32562b7
font_02_sfnt_off000128bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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