Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb25b7802e42a59…

MALICIOUS

PDF

76.4 KB Created: 2021-06-29 04:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fb25bd081ec24172182c1c6e94240b81 SHA-1: 697a464d0094c7230cf0e8bda2b96974bd5aa093 SHA-256: adb25b7802e42a599a5e2486321bfa5f7e0f11d790f5aa93bd3a8c9b9e867d61
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs that point to compromised WordPress installations. These links likely serve as lures for phishing attacks or to distribute further malware. The document body is obfuscated and does not provide direct user-facing content, reinforcing the interpretation of the embedded URLs as the primary malicious mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://coretry.ru/uplcv?utm_term=when+i+see+you+again+emerson+drive PDF link annotation
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/o3g1fat1447enl6mm8h5pjkscr/jituxexo.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/ab6b4c2fc189fd01f3dd1faf2d1d090b/75159227696.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/e07740aec68b05b2d464a74ad097a6f9/66149239575.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/nlcvea237omu9mvmor6hbn4t64/26196753306.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/5274617059.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/gesokifabasalefenunete.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/musupeza.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c5290d12d---gevuzeruvopukitisu.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/64610667662.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e827e09ec---26571788111.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160928f2eb7ba5---xukupujekuzuvolodibofarup.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/lutawofataxodikajiwijede.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160829fa1c19d3---57797265874.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607aca10616fa---robadagukeraw.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/10241175088.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/54888723973.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/07fae48c2970140290b702e461d8d14f/lawanised.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/b812761fe69cbbd06954886d89eacf46/40243922918.pdfIn PDF document text
    • https://umartravel.com/files/pulajidedipazolagosopefil.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/bd1b6f129998fdb6fa431c402d8976a2/26406369065.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_off0000ca13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 10824 bytes
SHA-256: f6ab61c9e79cf765067b4757dcb66fd07aa847a67a6988ddcf8d81a17932a003
font_02_sfnt_off0000fabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABF 16108 bytes
SHA-256: 6fb209af8ab732fc724bce96ac4eef783c1bf1e514f71eab7afbae3a144ae5f4

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