Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30c7bcb76f4186d…

MALICIOUS

PDF

73.3 KB Created: 2021-08-14 11:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da80760399bf2be79b024c623055e677 SHA-1: 53dcf5afb349e82a7e36693ba9d8bc89ecf17447 SHA-256: d30c7bcb76f4186de1a256e07e8a0848b57c2c9e3686c34aeac096acfe8fd6db
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://archinfo.ru/uploads/file/bezelafiwoletopomu.pdf In PDF document text
    • http://birnagarcollege.in/userfiles/file/80388379436.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/dau9g5st5g05d6b61qet78g354/tudelenumetasamabipuja.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c4cef7da425fb691272d5ced931893ff/54522578289.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/vmqimribct9nk2ecl3aeh45o25/tujopelikigowuzozifisonan.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d82e36faa5---61215945864.pdfIn PDF document text
    • http://ossokahve.com/upload/file/82870753429.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/a78a0b1a739b1d69b2fdb2a4a0045153/wujenegugasa.pdfIn PDF document text
    • http://pharmnet.cz/ckfiles/files/files/kotujimafajaberagazumaxa.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160871eda8c315---77727586643.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e9470d2bb71---80300354506.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/kuwew.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/54c6c555d24b8163d4134490de473e34/4362066791.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/1un68523h8sa5t2d8gtht4evtk/losadi.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/247960929.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/98001368884.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/wamuvowire.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/rd0ahif23etl8tb95gjsl0586c/7000035235.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/vitozegirafemekomavutazut.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/wimuguruxosufej.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/23230082624.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3a587d6a---47453667652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=solving+absolute+value+equations+inequalities+worksheetPDF link annotation
    • 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_off0000bc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8E 11092 bytes
SHA-256: 86377083de70640004beff3f742e9aed906e995604c135adc95673be6c92572c
font_01_sfnt_off0000d622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD622 15540 bytes
SHA-256: 1d1fe8467eece8409b000c6d8fd408eafba2e716f6e29350095071df448ec3ba
font_02_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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