Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55916c431bb7d32…

MALICIOUS

PDF

87.4 KB Created: 2021-09-18 15:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c4575e0c5cea866af5ec48ba31e1c6d8 SHA-1: b7520e4755d66958172cf3f7aefc4dc02b3c0407 SHA-256: c55916c431bb7d326ee22b60dea1e78deb75886ea3edee336d5c6d5d364fe6d3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm. Several heuristics indicate that these links are hosted on compromised CMS uploads or disposable hosting, suggesting a tactic to artificially boost search engine rankings or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://archielectronics.com/userfiles/files/vigivipipipupepubuvaw.pdf In PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/xogideninutovo.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/87530878734.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/zoliravo.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/52433961846.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/pigexuw.pdfIn PDF document text
    • https://iword.de/userfiles/file/ditatud.pdfIn PDF document text
    • http://becucci.it/userfiles/files/80052664482.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/57222036185.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134352d2c4b7---55048586127.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/48831863133.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/46498002742.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/79417043697.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613746446a9f9---31377840350.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/83644509882.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-12/20210912192149605942.pdfIn PDF document text
    • http://antracit.topmebli.com/content/xuploadimages/file/siwemarezogukufetimozodo.pdfIn PDF document text
    • https://aneri12.eu/res/file/giwes.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/kuwisusafapexifupanuvudo.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/liwogufogakegema.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/45556313529.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109081537202551.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/bce3cf2dab259f6180168b7d4ee0e36b/2779761601.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/d867c853g2rhr9crefn29s5vid/memoxoriledogos.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/jutibewe.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/xedatozapojuremepivitefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+secret+folder+app+for+androidPDF 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_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 10668 bytes
SHA-256: ff12a41b73e0e59db78e28aa0cd1ee66d9fbc389ec5c293e422d61926c21b7b0
font_02_sfnt_off00011dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCE 19408 bytes
SHA-256: bcd57a87417151b286dfc8d44af80200a4d34774ae0e897d1584ae838c069240

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