Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cabfe47c4282f06…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 22:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b27614208f5f198f1dfcbd19103715a7 SHA-1: 65cc00a5dad7e2d9a7ee9066f98949833f5760f2 SHA-256: 1cabfe47c4282f06f12ffe06ef3e01ee5221b9eb54111e69cbbdf855b8d239a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using external and potentially disposable hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://alda.pl/ckfinder/userfiles/files/34285668468.pdf In PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7877047ad7a962de2f52a53c87eb3703/sononodujulowetedu.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781eed362c2---dakitomaligego.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/62546445540.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/dakogaji.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/58900246158.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/58115389612.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b24de3a2e65---xixajidilufamitezetak.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/b3b22ae0955a425cd7f6e9ce7e65d2d7/lanagejuj.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/lonizikulizudobofamalur.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/96909390933.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/gotap.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ecea1ebb---99217378738.pdfIn PDF document text
    • http://lucavolpicella.it/userfiles/files/59534545761.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/34413407221.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b810639f4---judikosujozuvazamusakan.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/18188867909.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/12550842626.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/vatezaturawobugal.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb3f7aaac7---73257470937.pdfIn PDF document text
    • http://dgjst.com/upfile/file/sugiriguvitapejixitefuwa.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50083631871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=defy+dishwasher+instruction+manualPDF 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_off0000d65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65A 11044 bytes
SHA-256: 9d5bd8642eba193ac98b469d0ea00c0b75db7666ee7a191f4d32b24068fbafeb
font_01_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 19000 bytes
SHA-256: ebc4eeae1c48534e215b1cc8e1dcf6b1229f2fe35584e62830a631ae5b4d89b0

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