Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc44d47be23c80f6…

MALICIOUS

PDF

71.3 KB Created: 2021-09-28 04:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1f8f2b12152f554581c94088c1e24675 SHA-1: 3a8e82595e844307019dfd157d2cdf8adb82f84a SHA-256: fc44d47be23c80f6e9bd28abc4cc622a4364da1b8d39b534c95484b8dc9e5f9e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links, while 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' highlights the use of compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://medicamarsala.it/userfiles/files/zuvezuxune.pdf In PDF document text
    • http://3q1p.com/upload/file/210913052334664126gwke5n9xjzln.pdfIn PDF document text
    • http://speckrepej.com/upload/file/xokuwuxofiwakopuvelute.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/73441263535.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/pukomolovulewupenunixezis.pdfIn PDF document text
    • https://tierlistei.ch/downloads/limenemutibotanu.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/vovisamexidowubo.pdfIn PDF document text
    • http://aztkgb.love-mrt.com/upload/files/wevuwulolazoxeg.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/9642089597.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/51853251003.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/63173951751.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/84220825784.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/rssd47h0sfepusn0f5n0u5g9r5/juzirilagonij.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/28987249135.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/65946918449.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/limevakovenukibusigowon.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cf2980605---36322205338.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/fedf3bb3bf08ad618921182f692e5230/redakizuki.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbfa97b6c1---13329196860.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161525a940beba---kogorotazenediguba.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/53517373808.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/45423216840.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/vuxavowikusem.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/wazugexevur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=french+open+streaming+freePDF 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_off0000b218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB218 17288 bytes
SHA-256: 7f525d797092cfd8163582ac260433d49a2f55eeea62cea73ad3db9e47b1586c
font_01_sfnt_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 10856 bytes
SHA-256: 86f1915841b3722f31a58a072fa37abad4e51a0e31ab10dcdc096656278b7064
font_02_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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