Malicious PDF — malware analysis report

Static analysis result for SHA-256 29e5c16780f67a7e…

MALICIOUS

PDF

86.0 KB Created: 2021-09-23 23:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a160608b25de8ffd4cd1f1117fb1d8d5 SHA-1: 53a42a9bec4d6433b8fef79a560e77724e8174c5 SHA-256: 29e5c16780f67a7e0c01313dd069949a1884b7df9ac6c25af108a641ebb4acd5
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised or disposable hosting suggests an attempt to obscure the ultimate destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://olterus.org/contents/files/nurotowafekodibeb.pdf In PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5ca6a308ac9f69d3d979f5fa808a606c/nudijunedapuxeluzorel.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/lowetipexujobokako.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/86953814382.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/21823028836.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/4395269437.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16144315e5f953---64059232640.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/64208547264.pdfIn PDF document text
    • http://synphabase.ch/upload/file/29184695013.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/25947022784.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/85550965116.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/javisibadaride.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f21974973ed7063fba3cfd51e782ed08/47843668590.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/puwafagumebogil.pdfIn PDF document text
    • https://netlandschool.cl/files/22272204801.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/sobedariwamak.pdfIn PDF document text
    • http://gyliver.ru/files/files/dotepinidisemari.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/10b14f26d426e1d7a270f21e6cf125c8/kezamojujezimutitotererer.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415508d2154---vibamipalezuvipelepa.pdfIn PDF document text
    • http://aprt1day.ru/file/lukezedanademunoge.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/4378163250.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d43f7ea4a---3460499505.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/famumiraj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=free+stream+for+boxing+tonightPDF 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_off0000e742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 19172 bytes
SHA-256: 732e7a61b3d4fc1c823e6edcfea0c6505f8fa701667d80a22555d7040763a830
font_02_sfnt_off0001314e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314E 10832 bytes
SHA-256: 1fa064cafa03ef0f7ac56791a17e4d3d0a96361d6c98d87377f3249e315fafac