Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f82a380be3a776d…

MALICIOUS

PDF

81.3 KB Created: 2021-08-15 05:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b5f3e4fae0589dd16b79acf572dd3556 SHA-1: e34d25de3e3577590bbd8d45c87b060005d3f028 SHA-256: 9f82a380be3a776d08d0313aeb526507e4a6ae65d6d16f0ad355be870619ffee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is identified as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=diccionario+de+filosofia+nicola+abbagnano+pdf PDF link annotation
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/62092276433.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725417a87d9---visamawaluzo.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/53510969831.pdfIn PDF document text
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/dujizovubulimasimapadun.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609717a1d557d---jetomixerawomuvozu.pdfIn PDF document text
    • http://vladekoservis.ru/files/xopabogevevin.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/dafutuw.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/38049586915.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/8sq7m3ldbjqubh9avgmteuqvjm/89383868023.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2098b44f0---88658505390.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/31106028369.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/fivukizuko.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/d48a5770dab70532504c6e862781cc3a/12129426566.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/966a6147621af8dd017521fa7d167ef3/10670036566.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9021236aa---lirune.pdfIn PDF document text
    • https://lojaortigas.com/ckfinder/files/86246506976.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/69326536671.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f37d504da---67262627034.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/liguwunoremudun.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/70354444988.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16075a346bdd25---8402788854.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/87251244935.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/tozapisemunitatafujisoki.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0846f160061f4f6d3f83c32e50ee1c37/3440906566.pdfIn PDF document text
    • http://findplusltd.com/file/rusijonipogosuwim.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/b6339751f95aea8d3c1adf3100dc0205/xumijagorijenedu.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_off0000c2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C2 17268 bytes
SHA-256: a987251dd2609aaa92553999f663deb7a33585c9bbce67b8d489a6e34f5ad4f5
font_01_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 10836 bytes
SHA-256: 615f76b2e88020eacaaff2d4a19a88ea717ed6e896c49d2258e3f967ee2c1a38
font_03_sfnt_off00011caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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