Malicious PDF — malware analysis report

Static analysis result for SHA-256 4feb0e31adbb0217…

MALICIOUS

PDF

81.4 KB Created: 2021-06-28 12:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1dfd1ebc7560b91449e3b1a707977e51 SHA-1: 40a910abd9258f72a4287018ae73e6bc4dc264ec SHA-256: 4feb0e31adbb0217251d5f767b27a14be978d76f418fcfeb299746b9ed84d134
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the heuristic findings point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://oniceh.ru/uplcv?utm_term=drilling+services+near+me PDF link annotation
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/2a54bd6294c62c2ff5b164612042f6d5/49776387447.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/wewiguzabotaxalegoxidoka.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/22451999659.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95f92365cd---77061604265.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/vorulexumigogesexu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1ah7lrda0rmpd7mnc2old4nm7r/sukexalebamapuxe.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/58619181277.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/17e71594531f07bad036eab106843b1a/suwedamesivaj.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/u0o9bt13tom4dqpdrei846c8j5/xedigazoni.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/45106684827.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/tebulifu.pdfIn PDF document text
    • http://landpas.pl/upload/file/50683571584.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/nemijetazejofotaritusagax.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608501ed3d831---59605552553.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/japobemajoketukela.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e19c315b5b---telamexaxugudu.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b2fafbbb1551c42b285619161761c134/30043714152.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/7ed81bc2a81088e61eff372fbbba08dc/84999599011.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608de3db52f4e---gavenesogi.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/90795331568.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/59149363504.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/91442469905.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/eb5611c9eaf3d54e5abaeaa530a13332/42076354814.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bcfa46f5c---nexagupobubukil.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/93745858136.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15D 17648 bytes
SHA-256: deefb2502cd2bc7ee57d433a65c5b3e8251993b3446cba4c89cf2407490c3675
font_01_sfnt_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 10424 bytes
SHA-256: e2a6e5a8f18b6b15249df2deb4f9c1c51e1f0ff7149b81148b1f286e8cdeac97
font_03_sfnt_off00010ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA9 16720 bytes
SHA-256: b149aa8d1927573c92db37348b3c1e325fd900cbdcebc87c3ce86a35535649b4

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