Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04f543a5016386c…

MALICIOUS

PDF

79.3 KB Created: 2021-09-08 01:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 47f80a62f82ebe663f61becb12768c61 SHA-1: b19768769197e448eb7c060222e4e786a23330d4 SHA-256: a04f543a5016386c84eda6f1508622073e17604ca137755b941fd93165e58ae9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://karpatskiles.ru/store/file/81936840907.pdf In PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/288efb7b95ee38b279d73e1a01d06746/25551296239.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ags93orfn5ue4s3omorlppps5r/durixerumewox.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/76017803629.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/48133162792.pdfIn PDF document text
    • https://euchebnici.com/img/file/safumopawajopurimen.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/3182eef3f038d5e55757d6f5843e398e/joburegexoxiwefurow.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d379ca7c5---37835515465.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3d533bad6226815655ebd604c8f80659/65657630748.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210618080056_7ani2o.pdfIn PDF document text
    • http://mdtrend.hu/files/file/sorolikipovarusatiso.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df774e73e42---dibadazekugenutatizazod.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7535da73e9---pivevewoluvipasamelep.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612144e5153d8---97056153403.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/bimakelidan.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d7915d511---47020488643.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/d61f642a3c53b782d02986e1a31dcd34/vusakazebowiwoso.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/ribufivosopixag.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/gidofebifakuwu.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2e90e68e6---relakinir.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/xasomekodimokedol.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202194122138.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8c4e15e664e7d84a054071b5b9546509/xozezowimojavuzize.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2b31bfec---vixuwatixerutigegutex.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/dikunerozomukeneguvesaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=onomasticon+eusebio+pdfPDF 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_off0000c6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 10900 bytes
SHA-256: 4f1d7f461dc5c842c98d0caf8e98cacbc88722cabeb42aeab0cdd99afc236ec2
font_02_sfnt_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 21364 bytes
SHA-256: 64e1ce627b21c9e13923bdf18f98756077b784ca6faedb9273ffb6d6f3ca38ff

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