Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34c3367331fee57…

MALICIOUS

PDF

93.2 KB Created: 2021-06-27 23:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f522da54e638ffd3510e5aa4953aeb23 SHA-1: 8083ac1b79255a7692363df1784af4e45fd3dd8e SHA-256: d34c3367331fee571b203016dd30abaeae9efaba6bb25e6c82ea377cf490ec4d
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised websites, including those hosted on WordPress upload storage, suggesting a phishing or malware distribution scheme. The presence of these links and the overall detection profile strongly suggest an attack pattern involving luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/78cd648bfc27f3aeb2569efcb6eeaa38/pibipaluwinufizokevixo.pdf In PDF document text
    • http://reklama-kemerovo.ru/files/files/98520492413.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/fisararon.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/kikuminelegopesumu.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/sonozibawapu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608470f024818---giwekanowogumitadigizumi.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7fe741da8fcaf19c5f417e15a17095d2/ledewexusume.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794e105272a---55490799177.pdfIn PDF document text
    • https://fishboat.hr/files/kosuzigeginododezuzomaji.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2828d8dd505fa3b8916448670a5ea5ea/zagejigojamuvepiradutiku.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/kuuriqul6f11hle08nqrlnpdpn/migumonobuminowujikigesef.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608536d2d32ba---17612523019.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086a92749cbe---3642053450.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607041107cb19---galevagakamumejutisudo.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/0d8c5a73da7eb545ab861e5a441f77c1/9670977692.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/mafavewojetawigavusorate.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/satozovabokubataxawovopi.pdfIn PDF document text
    • https://genegurumiraclehealer.comuserfiles/file/rulikefagufafupadotetepaj.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6d7a3ca10d69d7149133956626e77796/topelekisuxenopodejim.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/64498703534.pdfIn PDF document text
    • http://webbuilders.com/files/file/82884239248.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430214838752864.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/tevunejeruxenafepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+quran+in+word+2013PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011b93.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11B93 18080 bytes
SHA-256: c4744d73795241caf1d6c0f3912b8eaea440e96a20c3600edeca6efca66b4d98
font_00_sfnt_off0000eb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 10640 bytes
SHA-256: bb61b9cf2829b68567223c081a13bd80223a987f1e2dbf68ca7dc7fa47cf4748
font_01_sfnt_off00010382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13817 17768 bytes
SHA-256: 20fbf682175d72976659d734b079c89fd858edc177df493c5141eea13b46aa65

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