Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff7218761a7f2b1…

MALICIOUS

PDF

75.9 KB Created: 2021-09-04 13:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3973fec5dfb66f7dc350a6432929729c SHA-1: b665e8d473e896c7ec85e3aa78d2909c5e8c2d58 SHA-256: 5ff7218761a7f2b1571ec2e640ae46881ad94c1c93f6641934d1de79923fcb9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload directories. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/15c8988804c0a0f35c53ef39785f42d4/kixolomilate.pdf In PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/59756710813.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/gcsspsbnghemmj45n7f4j6bud1/32300568167.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/ketipofazibu.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/66249801642.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9dfc4ac33acde9b742276a684109498/50687584209.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/9fc445bfd5328959ea8909d64a71638e/pusesiduwok.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/genirimiwaxedotebawagavu.pdfIn PDF document text
    • https://conberraquera.com/aym_image/files/44661142468.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/69909327657.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/82751831451.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/luwobuvupevurafijugo.pdfIn PDF document text
    • https://majubesar.com/contents/files/63366240041.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/6555335074.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/lepikagoragikofipif.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1ec4bb3f2e2b18fa73af2d8b7d30374d/49692523720.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///wakorutesetiwavosagupid.pdfIn PDF document text
    • http://linker-apps.com/files/83302711598.pdfIn PDF document text
    • http://vinmexindia.com/uploads/81696628910.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/fokubofotagax.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087713abe1b1---64071797735.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/22195458121.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/ligatojidawibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gaggenau+wine+fridge+manualPDF 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_off0000c5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 17252 bytes
SHA-256: 64152f35bdf0ba48c1eb1b522a5811aed5ee3900d93c878c4b5700130e5d72c0
font_02_sfnt_off00010a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5C 10536 bytes
SHA-256: b609c172e401f39c904f03e7c0d3fdee63a8d4509d4767018e570a0fba23a21b

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