Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c67e97830a1d58b…

MALICIOUS

PDF

125.9 KB Created: 2021-08-08 19:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc577ba6c694b72bf6a68fba1946c3c8 SHA-1: 3bdf562bf2a8cd96a5824ccd156cb6ca3ca82e66 SHA-256: 1c67e97830a1d58b205113e6655932cc611896f96fc009f2ce0a4e30d3936769
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to lure users to malicious content or phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=programme+musculation+prise+de+masse+a+la+maison PDF link annotation
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84d1cd34ca---17189740937.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3b69a52f---nadovulupijaxufujadekolat.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e4887a403---62252135437.pdfIn PDF document text
    • http://pb-book.com/user_file/file/kavuvun.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb81357db5---54220290558.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/6937af89cbf200b238b06e4c543bc00f/99238057216.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/54430174302.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/55050305799.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0975727da57ec27b5ab26f1819d6b8ce/dupulafof.pdfIn PDF document text
    • https://unosms.us/userfiles/file/gifega.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/3e9db54f472f0ceb913590623111bc9c/lijezijeb.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e04f0888b---185379397.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5eea64a76---82717665100.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/sibezepaduluz.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7eec1fdfc---59766360002.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c300ea7f598---datoxowoxuzo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c55fdc61b---53162700839.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/252e8cd0d372e5031eda0e5564d950b1/rakesonaxoju.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f9869583a11291f7e46d6fcef375379d/sumivutuzapopoxebedunozem.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/9077501195.pdfIn PDF document text
    • http://mooneyes.pl/userfiles/file/wewotodibopemelorebu.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/mudofupitidolizaduf.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090fdb175978---setemo.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_off0001846b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1846B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C7D 19800 bytes
SHA-256: 25847a458ddb873ec007912e7dad0343094ff324e93f00c1cec206cded6e91aa
font_02_sfnt_off0001ce08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE08 10960 bytes
SHA-256: 7265eb2091b2c21c34950250152668ab7e8f8427805174d86cbc65acd35b921b

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