Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f194a8ec8aab21…

MALICIOUS

PDF

85.0 KB Created: 2021-07-03 19:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e636972d6f054e23b6cd2cbdb0151884 SHA-1: a82c53f04c669f6418ed1f4213ad98f46fa2c417 SHA-256: 83f194a8ec8aab21fff983b880be1d94bde0faf1b241a702a733673810fdaf7f
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bed98d587c---97181623545.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/db518b01928e8baac20579c4a726401f/rilobowetubifumedopo.pdf
    • http://intelekt.biz/uploads/pages/files/tidoxerotewo.pdf
    • http://constantemails.com/userfiles/file/162472725911083698897.pdf
    • http://sun-eko.eu/files/file/lotabatezowofoluva.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/817892e054517d3e880bbff50d3d81c5/23656419718.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b97a22a49---bakomevokirujavafiju.pdf
    • http://cherriestattoo.com/ckfinder/userfiles/files/zimezafigitudokewutu.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c914c61beee---dugesuxo.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c1d815188330d53d8337a7e71b9fcb70/32295630871.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8ed521f79b6493852def504052de8061/58248108341.pdf
    • https://people11people.com/uploads/File/71943141094.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ab5e34519---73220208047.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606cb7951dbfe---92433847040.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f9a94fac9---55581287191.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/cea27cdc6cdd1bd52600776b5be805d7/4949373424.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73621cbd5e---temugakoriwuwerazofeteben.pdf
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/ruzesedizenuwu.pdf
    • http://codemessaging.net/ckfinder/userfiles/files/22969052982.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/023c4691176451017c9e76da5ef7aed0/seviledojexekarimojizaxe.pdf
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/59633335415.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e0ed6819---32821343455.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607716b18bb51---85792821292.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/11a5a59a11d4a2fa52876ddbf3c5e32c/darovef.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=drum+drawing+easy
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac5.bin
66d6581919f06a16cb0c1a58767108ac164e7c2264b70619821bccf359351d37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 10628 bytes
font_01_sfnt_off000102e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 16792 bytes
font_02_sfnt_off00011af9.bin
cef6fee12ffd7e20ceb40df2aabb853f28558c5fd90ba4e05f5ad9151f2980be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF9 16832 bytes

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