Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f1fa8c6ce3567e…

MALICIOUS

PDF

85.5 KB Created: 2021-07-09 13:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c88f9f4138d3fe55c11478cbea17b5c6 SHA-1: 8987b6cd1644022deb175af56a2c7cada597d12b SHA-256: b4f1fa8c6ce3567e5fca3fe02b175941eb6ce59be56a64295b04c5faada95768
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://tractorpulling-emmeloord.nl/upload/file/kigamunun.pdf In PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fdf7b3886---66774643346.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/353b95e3420360ad81c2363a835aae47/bapexoxuzudefixavuziwojax.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/44029098618.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46a05a845---gifej.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/13ba7eacbaf0ce15237f0d223f3942ff/porasiji.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/39211702091.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/18067368105.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acead9ebaa3---telodam.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/42568627916.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/gamapupip.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/82429513914.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/wusotuvamamukalusemajukib.pdfIn PDF document text
    • https://flyags.com/editorResources/file///pizopomam.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/zerazibadibitoruwufu.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/16442334431.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/dufomokuperegi.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/digiregisumede.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/mugufiraniboriretemo.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607886171559e---gowat.pdfIn PDF document text
    • https://airbays.com/userfiles/file/velivufusuxotorakaragevir.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/23451432042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=no+skin+off+my+back+meaningPDF 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_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 10760 bytes
SHA-256: 2b563646031835a6c30bc7f9bb78e90379ad6c068a2627575fe72985e845ce08
font_02_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 17220 bytes
SHA-256: 972061d26fac3c853569962b8139e3a096ecd4bcb02b674757b7b6a945bdccfc

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