Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d378751409343a…

MALICIOUS

PDF

89.6 KB Created: 2021-09-01 07:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aaecade290ca44ef1d048e4eef68f573 SHA-1: 644c4463fe90f8fddea692c524ccf068ecad9f5a SHA-256: 59d378751409343a281ee95a9e2c5c865ee707b42633c0e7d18f3a7d17acff8e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d80da3cdc52---wituwatalobimo.pdf In PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/826575ebbfb70eef123d68a201947826/71571547422.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/8a183ac3287b8e6ac1638c8856f8e1f7/15380374992.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/pekovobilufejenovuzogo.pdfIn PDF document text
    • https://andrejc.si/files/file/daninamodezamanizalimesa.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/93951837445.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/58395344388.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c964e9d8229---lorilufolobidi.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f19f20f79a725a3ae91722dacc22f7ba/lulusororu.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/21047879157.pdfIn PDF document text
    • http://aimic.com/userfiles/file/nuvor.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924098a79ca---zakugizuwanawaliwabut.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/5592211cf78a51f0c1d67c20a5571554/34789348439.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/pajoluwulezogipabonesezok.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/vebugorej.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef586557e2---lupuneli.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/lasubinupifeja.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/fovatotazanulubunovopunap.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/mosagewujogomotetu.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/zuzika.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/78978718800.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210807233542_327365.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/40195081111.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/55413898014.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/30003538628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=manually+sync+music+to+iphonePDF 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_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F12 18560 bytes
SHA-256: 956b18f963540f90fceefbcf2cf8dc3ba52d0d1a5d33f5a72ea2b7c9e5c542a7
font_02_sfnt_off00013ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE7 10744 bytes
SHA-256: 11b596698194fbd8a4f46f8525b6f180a8425cecb3ea81c65ecb2ca19cd8ce38

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