Malicious PDF — malware analysis report

Static analysis result for SHA-256 438587515b793813…

MALICIOUS

PDF

82.5 KB Created: 2021-10-12 10:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ca26ed360e32860663aebc71f8c95ecf SHA-1: a508bacf4434c046fc322adf30ab5a2549d5808f SHA-256: 438587515b79381358ec5449b1531dd5420418885694c536427dcf54114d9e94
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links are likely designed to redirect the user to malicious sites, thus serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://mywayrtk.org/userfiles/file/rexarif.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133bc88d61b4---97832069892.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/97322322302.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/77017488089.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec93538b35---43374347603.pdfIn PDF document text
    • https://penzehir.com/dorceiys/ckfinder/userfiles/files/tenofobuxibarovobumazal.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/jugupumotogumolup.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/gijunizoduja.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/kavotojazepuje.pdfIn PDF document text
    • http://unsersohn.ch/images/file/tekip.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137acca346c0---4368705656.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161642a7c4519b---mazubepisogi.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/kodit.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/bavapaxaxonofenuzavise.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/43674809580.pdfIn PDF document text
    • http://darec.sk/files/files/wijifofevadase.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/dupawumenuluv.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/96875105232.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/5346252267.pdfIn PDF document text
    • http://ontozescentrum.hu/tmp/79482097704.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/83517657839.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/37179010537.pdfIn PDF document text
    • https://akconta.com/uploads/files/20181193108.pdfIn PDF document text
    • http://aquatherm-graz.at/files/96435226761.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/6486150584.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/59190474523.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/cmwvf4RlXg4/uplcv?utm_term=indices+and+surds+formula+pdfPDF 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_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 20260 bytes
SHA-256: 4290cf39cc4f0c2e813f90d11619c9efa795489c1ff4326fb17dcdb388ef2953
font_02_sfnt_off000123aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AA 10732 bytes
SHA-256: 8d54e19e1735cbcf76e1b9fb24ce1bba42831f85924dc7afddeaa7f4f3ee8ba3

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