Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f09ee9f343a65e4…

MALICIOUS

PDF

99.1 KB Created: 2021-09-06 04:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0afed6d7a830222956108f4e505ed001 SHA-1: 492dcaa0adb58d03869b0b4260a442b74928739b SHA-256: 3f09ee9f343a65e4bed33143dad9b385a1257a49a0bd33e9ac139783032dbb46
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised CMS upload directories and disposable hosting domains, suggesting a phishing or malware distribution scheme. The presence of numerous links and the use of compromised infrastructure strongly suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cancercareresearch.com/userfiles/file/livawufatijamo.pdf In PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/nia4g4vlvb56mg627g1n4n391n/18309101652.pdfIn PDF document text
    • http://sooclose.eu/upload/File/gibitukasawamebur.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/b618a3a6557142040a1df81869af951b/dokugujazexamek.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/zibero.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/7669492109.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608391c803452---giluj.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ec77ac765919f8e68d351008ccd4f909/88866820476.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///toxidadanuvozujeja.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/kamegu.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/kekidexatimosi.pdfIn PDF document text
    • https://blv.by/upload/editor/files/tabibamevi.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/217s5unoam6ljoumgm6u2cm0t6/daped.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/gunikujajubepujuvuvufuve.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/4qd5gn7mnudemm411otbjpsop7/51579425991.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6c8d5758f---78318584066.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160809427162bf---gipozilijoverakikiwapapet.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/53223419399.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4802e118e31bf021f6d93609c1b37dfe/32997037474.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/fexadalizomos.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/42091612249.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bf92366bc---mojizosedodabirobodavav.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/nisizuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hillsong+chords+pdfPDF 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_off00012063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12063 10496 bytes
SHA-256: 5236fca1043cf192b8efe8e5a655b3e453935329386b37893f51860a79f4f95b
font_01_sfnt_off000137cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FDE 18140 bytes
SHA-256: 043591bf0fb4ce4a914763cb3caf5b545ad7c224160dc56392620a5f14711275

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