Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1bd13e5490f9a44…

MALICIOUS

PDF

72.8 KB Created: 2021-09-06 00:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b2275a6f7c384279ef06aa89f9c11d0 SHA-1: 4fff1f0b5c7894a2f2abe6902a2f5549c753d7c1 SHA-256: f1bd13e5490f9a44f8ec7cecdf90e692112e6f0491515013d4c8d5be5a4273ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=adobe+pdf+maker+not+working PDF link annotation
    • http://gerocuki.hu/user/file/folirovifavexujajufiwirit.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/43511830674.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/borurokataxujixigi.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/97bcd8be5d1b069f5ab689fe39c73f62/98333877968.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/gosobezubulevikefi.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b15bd993b---96472808983.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/49248056097.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/wofevubukekatalagoxob.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/48101020210.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/kuvofofikiniwirozef.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/10162372604.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a745f5105ea1712e8c68471d2e01d384/vefomagorupofavipimizul.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608316e284336---mewapeniwadizu.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7e687441d7da5bfa43bfb90d503adaea/mabuvedavubulikesadid.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/cd31ef7b61778413fddc77d4473f714f/pefivog.pdfIn PDF document text
    • https://gilbertems.com/videos/file/41765442573.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/87676903894.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd4db88214---88044488280.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e476cc45e---14526870205.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/zegewebujefenonurunij.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc85d878d0---96076835542.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/7ce9cc4bfa710c6ca45090d1a471d075/47379462598.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/xisiperopupix.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/domijapofa.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/7046622594.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_off0000bb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD331 16432 bytes
SHA-256: 7939a5d014d02425f79e0ca7c76b3c508522e2910fa41ba18f2ae250016c0a63
font_02_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 10928 bytes
SHA-256: a8b17fa17951e479518121e95ba6db5784e8199711a2aa207323e47abdd7fef1

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