Malicious PDF — malware analysis report

Static analysis result for SHA-256 932d6ac44ee0dee5…

MALICIOUS

PDF

98.9 KB Created: 2021-09-02 21:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 048440f0af65569e427ad24354d50248 SHA-1: 95fa03a7cf44f2bd8b56fc4867d9970d677f9008 SHA-256: 932d6ac44ee0dee54485c7206c2d657b574a914972fe5a79772fef531811a38f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content, likely for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=essential+cell+biology+2nd+edition+pdf+free+download PDF link annotation
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988a92c07c2---vobewasosimax.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/79546164626.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160860f76db136---seguvitenitazizufuvipa.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/japajodukasegivajum.pdfIn PDF document text
    • http://manleyboone.com/clients/3/3d/3dd19be848c73b0ce3a0430f7fd535f3/File/88579543232.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/71023957318.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/povozalepixutolovona.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/xixolunap.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/fc8vpmg8mm7cc4uopfbs054rc2/63974014719.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e1da05ee---zasetekik.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/59877559862.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/22875704271.pdfIn PDF document text
    • http://bbgannualseminar.com/clients/6/60/607ac775fa755cf068047886b2bbe24d/File/22136364208.pdfIn PDF document text
    • https://papiratisk.cz/soubory/84753258791.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/ruzefa.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d02c83832---33932778493.pdfIn PDF document text
    • https://airbays.com/userfiles/file/zaputumojakefizuwapole.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/porukidopikemumomifusuv.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/0d3c4dd5c98b660c1c752a0dfe150ff4/puxes.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076baca1c8b8---zetorezabobigur.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/79700550642.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/62866184679.pdfIn PDF document text
    • 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_off00011793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11793 20000 bytes
SHA-256: e88e5ee53a5598d7035ed10d83ceed6aa78d60d842d51096dc13def35c0de9b0
font_01_sfnt_off00014afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16313 11236 bytes
SHA-256: e114b8638adc90f4fb4b0088901b0feebb210d2f8a9df25131e0e7f8571d3e1d

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