Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8e27ae622f76ab…

MALICIOUS

PDF

90.4 KB Created: 2021-07-03 08:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e7f14c2820bc121778da8f9fd9639d3a SHA-1: f8cd18a40559e9315cca7681a1e7600806f7d159 SHA-256: 8d8e27ae622f76abc28eb489475655b37036f7de299b35fb1cc726797677f700
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress installations, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and contains no readable content, indicating its primary function is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0c05d7b7f---94157047439.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792ccbc7faa---disolupumonodanesulorikur.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/17832512135.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/8800570208.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/64654584321.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210521180912133.pdfIn PDF document text
    • https://phillismaniglia.com/wp-content/plugins/super-forms/uploads/php/files/6700e4d6b00147d13a972daa20b4fbc0/83675014955.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/ifivuda3a7oi1j27o6bn09neu1/52646947889.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/81207037469.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/0e4aee8a0bea119eb21e9f337d1c7751/kewojuleluwotaderar.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cebfa768ca---butojasadamotigozu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/coj1td2op4r8ggu9rgjiuifiv1/66235831888.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8df367656---jedodazulobakebibapuvom.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/26226464414.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/tasonokuko.pdfIn PDF document text
    • https://pasarantogelsatu.com/contents//files/79709167057.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/33264208640.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/79426295304.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d981db775c---88154492985.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/vexix.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094567027a06---devixawozef.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afbfe73965b---votenotawamis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tongue+and+throat+drynessPDF 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_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 16900 bytes
SHA-256: 3cb6b7e1de4bcf0a7e94c19c82ba29a23a818563cb22292836ac006cb28744a2
font_01_sfnt_off00012c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C61 10564 bytes
SHA-256: 48743b6a2ba87e606169b1890fd878c8d700642a6417abf557ca0f1f1851e2a1
font_02_sfnt_off0001444e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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