Malicious PDF — malware analysis report

Static analysis result for SHA-256 c781b08b53c5b6be…

MALICIOUS

PDF

85.3 KB Created: 2021-07-10 01:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17f69d27bf3b294561e67824c75d3c52 SHA-1: 03624036f7cfda6a2014ad583826080e2c8720ce SHA-256: c781b08b53c5b6bed6c3371efd7c3fa3edb316383f7f4f17c3d64bf0d2b09ac1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The PDF structure and embedded content are indicative of a malicious document, likely intended to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=hiccups+after+eating+newborn PDF link annotation
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b9abac842a7---jilasewopiz.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/22204c637f9e14749164a01a077fec1c/13175385396.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/f949baa8f8005f7f1eddbffa2042f1b0/58734930616.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/978501d365c5f554cbcc29bbef29dca5/golisuletemukesifel.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/mubavixojemegidokaxajaw.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/j2opvup2e1kv5ep6b7ijgmb4k7/dafufefizixafogazeba.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3db48dff0---83654039927.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e53e6a401f---walivawogozuzu.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2153a6edd83cbe45b3aff3a81a168e88/zixidenivizaporuliposefep.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e67b3268e---40894626199.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/uojp16ak649cmil4q37jtiqf7k/wanorinap.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/qskor27eg1b5pa5pu764tbcrki/kadufakeladusamawirason.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/9631529246.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/44207165288.pdfIn PDF document text
    • http://abwessex.com/uploads/files/manobepuvug.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/morewibiwuwosob.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f4868c2fd---66533470671.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/mthhememjvsbvda7ngmikespi5/wurexesidutab.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/8e68ea20e5e03bfd876e1b7101f9857e/tijorumadenubuzakumabono.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/14747435084.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/kiwemevopavudonamovibewu.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160779d8305cbf---demenijubogapebuxifanope.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///tozuj.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/e4j28a6k3945hngsh4q5p6oiue/lazukoxin.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/bncktml7ivh9se7s50c77d214j/wekezuzilela.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_off0000ec0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0E 10928 bytes
SHA-256: be55a1201c6537aae6d22e0cc3eb8a7bfcfec0c3b3e927cd50db7b8fa462fbc7
font_01_sfnt_off00010565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D77 16288 bytes
SHA-256: 868ccea5b89804fa2f8dd75b1698da592d7611e50bf4543ec5f9829318ce046b

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