Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c6a6f28b77385d…

MALICIOUS

PDF

68.1 KB Created: 2021-09-09 20:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c8db446ba84cc007209c637cac756d3c SHA-1: f2e02b10698aedb0745870327023296ebc16a2c7 SHA-256: 42c6a6f28b77385dd7bdd8f43dc5cca219292dcbb5a3e660ec5536ae7477546f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://westernstudioservice.com/admin/userfiles/file/tozinidovotagulagabi.pdf In PDF document text
    • http://metabolizmusonline.hu/images/upload/file/bonukesovuwow.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613677d6c680e---padufutalo.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/66079827956.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/lejigek.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/kesuta.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/vixedezuxiditemenukapevif.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/diwodotulogijidimig.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4c9d94c8a8317b793389ee1315be08b4/19587824674.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/28405be9a60e1cd76f83de56774c03c1/gobojafoxiv.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/q0k11rfo0791i4mjdgnvbjk6ec/naziwe.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/32866952422.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/3916123376.pdfIn PDF document text
    • https://digireg.org/upload/22100925244.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/17162019668.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/godatam.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/18534170726.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/87248910225.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e42204462---46480375770.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/xoxewurazu.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/bikixuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mp3+mp4+juice+ccPDF 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_off0000ae10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC627 10212 bytes
SHA-256: ab1acd58c1a46c14fa8008ed2394a2dcfd56f8f03770b4d106d325b0b7fee0bf
font_02_sfnt_off0000dd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD17 15160 bytes
SHA-256: 15a05c0fb9e066739d68dc24f47420e499cbdaa12e77417099c556fb2f2e9da6