Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b456517722cb04…

MALICIOUS

PDF

86.6 KB Created: 2021-09-06 19:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2c2d9da36fc02f7248e47bf35d378633 SHA-1: 9d3e1520d617b46a49624d77c990b42db14a6907 SHA-256: c8b456517722cb04619c22e3d9076d4e8a7155c1db463aa94f9410bcffcd399f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

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 http://topstec.com/d/files/navegarexemowopu.pdf In PDF document text
    • http://congseng.com/uploadfile/files/tonefegozilamax.pdfIn PDF document text
    • http://scpt.it/userfiles/files/sewubolidaxuwur.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8c165fefc---41922044469.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/pojunapik.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/3b2c462407a7484ad3655873c145a56c/sowasufupogizalubud.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083f0eca4f85---kamofolitixezunixade.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/f86a1d2fc96a9c0811f7f77d769abec0/9046152716.pdfIn PDF document text
    • http://belst.by/upload/file/94954003609.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/fbcf237441eb7a48013fd5f17a6403af/jojebobumobovab.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610b00a567266---visegomanarezexawixozi.pdfIn PDF document text
    • http://kelvista.lt/images/files/82438990560.pdfIn PDF document text
    • https://actorconseil.com/files/file/15099071336.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086143701135---wofuzamonotosobipajosol.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/386019eda6638ac12764e13ee9864b7a/batinamozumomapekosuz.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076823ca3757---77441176198.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/94424482465.pdfIn PDF document text
    • https://aokman-drive.com/d/files/mezidube.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/36901766545.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/1svc9osv4uq0rdj8dfuge2lbq1/99601109087.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/mikazorutafewu.pdfIn PDF document text
    • https://finomisgurukul.com/public_html/userfiles/file/40764118819.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210726_072925_9893.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/63da93b4f6149b84dda908a61562aa24/virikuxekuroxab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=wall+plastering+machine+pdfPDF 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_off0000ec8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 17932 bytes
SHA-256: cff3276178b514a7e44c93dcbb97907dbbbf5b40ef1db0ba95a9a6aa106a9887
font_02_sfnt_off00013371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13371 10940 bytes
SHA-256: a69071de3cf2167ac9659165e24b65cb19cb71d0ea3eea8fd4b1de04c6cbfc39

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