Malicious PDF — malware analysis report

Static analysis result for SHA-256 12bc26561f773c76…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 09:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7ebb038f5b899fcd084317b7cbe36f86 SHA-1: 85c9b0f72e1a6c932f396412c6b521474d861b29 SHA-256: 12bc26561f773c76d6802cf55dd9652e884911b836ed3e437212a153d6da9b7e
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=mirror+my+screen+on+chromecast PDF link annotation
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/rt3t9qa6l7doglrnm0mqbhl9r3/fizibozaxutumunegajozemu.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/45317013677.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/juvutosefana.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tubijukiruxovidowo.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/nugolo.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/57355040336.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210901_60D60F135902A6A1.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/simasisagosekovupegijir.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143014c2ab75---vopikupiwabegutet.pdfIn PDF document text
    • http://halanmilk.com/upload/files/74916569765.pdfIn PDF document text
    • https://12shio4.com/contents/files/bemev.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/f9ad374f332fc2001f49d4b93fd2179e/nemakelagomite.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/45676678646.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/zipatajuxefuxiwemakiv.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/59259483520.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/visinifolovabukebom.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161436d88361d4---fexibebonebivikawegib.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021912133643461.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/94171504322.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/76320974651.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/monolisupop.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/pozubelajevigowabute.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/3kdto4f0v67n6p44rkhtg7fqoq/ropepufoginodavarukizono.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/benovovi.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/mukaza.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_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 17932 bytes
SHA-256: c55520905166af24f7a29fe676875f23109cb182212c585f3c493f8ee4c77bd9
font_02_sfnt_off000122c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C8 10556 bytes
SHA-256: 8b5b1fab1e6f512ca740ebb5e03d12e056521a2344ead09601a24d0e6a8ee6ca

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