Malicious PDF — malware analysis report

Static analysis result for SHA-256 686b38494fab1d58…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 14:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3bc3e5c25a15b6f3063a56bef9986e32 SHA-1: 87d50afd4b231070adcbbc7e22fb2a23642609c9 SHA-256: 686b38494fab1d58cb557490b011065a4356c9d62a2b6f34f19bedf0dac14f48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and compromised CMS upload links points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=douchebag+game+unblocked PDF link annotation
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330cf005d2c---kenig.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/58131236338.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353c7cc32a1---zezazuxajixomiga.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/6187553418.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210904/file/nedebuxuzin.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/74298138388.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/41810617120.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613838c289305---12364660638.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/52105265556.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/wevinatutovogujekatatevaw.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/43205371676.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/19896344676.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613726dd4f43e---zanazudurusotilexizof.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/watoduvow.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/78176855831.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/57009447289.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/30975648209.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161303602e6b92---76230458593.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/64803748872.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/62475935789.pdfIn PDF document text
    • http://sudeoksa.org/userfiles/file/20210907092132.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/xapopore.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/10344962431.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/88629193451.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/vojagutufabarapuwuxakija.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_off0000d764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 10692 bytes
SHA-256: cbdfecbe0a61e5b460fa0f16d2d8e314263b42ccd28f978e7655375efd198966
font_01_sfnt_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 19424 bytes
SHA-256: 4e63c7c49dc8468d372bddff65c6cd068a340101ad5ea4a1c9bed62b96b8ffb4
font_02_sfnt_off0001225a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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