Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1642152a4e6d20f…

MALICIOUS

PDF

78.4 KB Created: 2021-07-07 13:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f90a39fe093dbd0026fb62b24327adfb SHA-1: 459d26725c4524e7a14bd6a7710cd6d48504338e SHA-256: c1642152a4e6d20f901397478564e68e34a7853091f1fd1b03734c4c8a005539
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The document body was unreadable, but the presence of numerous links to potentially compromised sites strongly supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9deb7cbcf---67644592333.pdf In PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/f35eo3ratm5b9el0kdml8kv3qe/vunabodiwarewete.pdfIn PDF document text
    • http://www.siposferenc.hu/html/91371821633.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b81e7ff2f17---pipunitokulorix.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d4beb1c398c01135140ea03ff7811fc7/20333468834.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/xoduzaxiw.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210608041226.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/1cdf9raeguhaji8v8g0384c0o7/15194465459.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090e42a006d5---nejasojejowasonotuvigoku.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/d114026936042e382cbd04387ad77984/liputupategiraj.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bfee53a35---84490425137.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d736b588f---potixu.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160757bfc1716a---lurafoluwidakojuzasebuxaj.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071369b21fa1---zavepu.pdfIn PDF document text
    • https://globportal.com/upload/userfiles/files/74449911806.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f12c4565---ronomumojuwakinas.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074451dac545---kufajorizimogidivuni.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b108474c791---wegefuxol.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/12779326924.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/a9f8d30795a06e8a49a126a4c6187bab/92091512160.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/mobix.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/18274633569.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56e66540ab---30862296508.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/8b8fbb720f93bf1281d961efa412a658/9818306778.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/43115009750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=open+circuit+output+voltagePDF 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_off0000d203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD203 10572 bytes
SHA-256: d4a11975e27d983978fd5fea1991733a13f836c8741bd16286f02f480103241e
font_01_sfnt_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 16152 bytes
SHA-256: 621d8926dbaac552315b0386424f7ea125cd02da15d5eea0c37731ec1c0c57ce
font_02_sfnt_off00011420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1