Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf72c977cc58356…

MALICIOUS

PDF

80.2 KB Created: 2021-10-05 07:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 22133ac0bc084f81f58cf808356b3763 SHA-1: e81a6d52ee97f68ae7575e1853d76ed98b0b75f9 SHA-256: 6bf72c977cc58356130ca012c17b4a9ff69b4ecfd26c1fc4bf68161d4d77af0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=baby+white+german+shepherd+for+sale PDF link annotation
    • http://tienphat.vn/imagesflashupload/file/44061863088.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/55103550596.pdfIn PDF document text
    • https://kopari.hu/files/file/veroseduxorimijut.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615241d3c0a76---netaxogafugoxe.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/911f187992265d72182c568f856dee12/61940018239.pdfIn PDF document text
    • https://garmin10.ddbseven.cl/userfiles/file/55835502846.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/zadap.pdfIn PDF document text
    • http://smirna.pl/files/file/15329059077.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/28726265961.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/19255716420.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/97151689542.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b20216edff283e4357d7e077ee2d6785/56677798769.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109271233117716.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/73458524582.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/44114176459.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/sopimodexupe.pdfIn PDF document text
    • https://terracell.pt/images/file/pufosugalibunovefokolud.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/21804210551.pdfIn PDF document text
    • http://guowangcable.com/d/files/levamuvurowu.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/34396039418.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/kumevodekazexejapadexu.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/mizazesu.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/97860673493.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_off0000cf9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9D 11336 bytes
SHA-256: 44c830f986ef20058d3a9c44344d817d92cd6d1fccf21be9c0d721f35621ccf2
font_01_sfnt_off0000e9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C5 18920 bytes
SHA-256: 3a6c32e3acaff310a70ddf143d75b75dc4b550934a0e16a65bdf0bf3870d42fa
font_02_sfnt_off00011acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1