Malicious PDF — malware analysis report

Static analysis result for SHA-256 b270d4939a69e01d…

MALICIOUS

PDF

92.1 KB Created: 2021-07-06 23:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6062835cac2b0ff2a66c6dfca282a20e SHA-1: ba0661ca2870794eed1ec645a3e6b75a7540aa11 SHA-256: b270d4939a69e01d78b2a0e6dd4bf362d2dc986844ea12867e14fbce74670808
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as a lure to download further malicious content or phish for credentials.

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 http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b244c1c0f40---zoretevijujegarufura.pdf In PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/3g17isvdp9h9ruf7lueihijir6/41799760445.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/25156613006.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/xevatexatef.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/73514726583.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/94870417603.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/d64948028840b733b882e13df96a46d3/xusakupirejo.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b40ffb7bae6---voxikutekavokunusovubiri.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b567564d8dd---82118238405.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/wogekinezupabegakisaj.pdfIn PDF document text
    • https://loctra.net/userfiles/file/65816678671.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a793069e52e---45215152513.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/94955380053.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c15a842eaf403c1554d610b00cc4fe64/sawafaderexekabadomeg.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/c1l1tk0kdlp759hv8pdvgt332o/xaxawijuludo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d14711d7e0---wabaxagipot.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be44f37abd6---11287953906.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/5a242efb67ab21511d4f4b706bdac7d9/finufes.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4514add3293b53b402b037130df0774c/7477263285.pdfIn PDF document text
    • https://codecs.ro/images/file/95131993485.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/dazalilivavejogizepedimuj.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/939776a76202d159a9f7636852c39cb7/rolugodig.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608a29e935811---24106735593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=millon+adolescent+clinical+inventoryPDF 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_off000105eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 17164 bytes
SHA-256: f17827a663c6a44bcc3c0077057f1fb0d9736385e9c5658f40bf1bf33274f5d5
font_01_sfnt_off000132de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF5 10536 bytes
SHA-256: 34021406b6f4ec71385552961e40223f47048a9a87e37e4cf92fde9a0c856690

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