Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe6328d53b2af44…

MALICIOUS

PDF

107.0 KB Created: 2021-06-29 08:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: afb18688167a8c3bb63fd54a675bb2dc SHA-1: 6e01d5a4bb2bc673afc8e4f5caecbde5398f3e61 SHA-256: 9fe6328d53b2af443997293134ec6c62a2feaf38df4c39f50337d3f5e27a6075
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection as a 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/1007976c82b276542c9bdc19447fd916/nexokametejajexilirekizaj.pdf
    • https://callmarkinvestments.com/callmark/files/xapamufugarerenibapaga.pdf
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/h1h4ceqdgnm0sdprts1bvga2nk/sifizozem.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a864bce6eb8---68429919991.pdf
    • http://kamennykoberec.eu/editor_uploads/system/files/bipozezorukorexelesaded.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096517bd3104---95947851594.pdf
    • https://accuratesearch.com/userfiles/file/ponin.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5f4fc8a5766557e8b4e3b4ccc9fab36c/palatonuvofejetatoda.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867e9a3178c---biwudiritovaxexafoxudor.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98afd13e0---198429453.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160839a39997b3---lepowiw.pdf
    • http://toonesk.com/upload/zomekazevikeruxuborivev.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877d1feb0ec---betetepabufegop.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/9a3b4de09858409615fa698bfa26caed/47335404993.pdf
    • http://taxilitomerice.cz/ckfinder/userfiles/files/kivegovowobav.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/ac5833de6d9b6370583c12b4bfcc706c/xitut.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/63cce6b36177f870656d9d0fb8a30b1e/10659814544.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/6s2187girem7gq3qija9fo5kse/16611280141.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ada74757cb7fec83cf9fdb7f4631c838/8641876456.pdf
    • http://malbreil.com/userfiles/file/kuzorige.pdf
    • https://spacio.hk/attachment/file/53220782268.pdf
    • https://dianthusindustrial.com/resimler/files/60425208158.pdf
    • http://alrabbancapital.com/file/files/gegevixu.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/34763011225.pdf
    • http://sostrevalli.it/userfiles/files/89836910311.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=forty+in+latin
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001311a.bin
b4bcdc4415cce0da751a4470bf42e892fd452d8a6f49dce29e390bc834cd8011
pdf-font-stream PDF embedded font (sfnt) at offset 0x1311A 9892 bytes
font_01_sfnt_off000146fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x146FC 16792 bytes
font_02_sfnt_off00015f09.bin
184a936bd1ce5dff700adc4e6a12c67a52a21ba3f6bd4f31defed58e18ed8b92
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F09 1856 bytes
font_03_sfnt_off000167ad.bin
d9edfa33640dc3fa537176077c575ad56b859694c367a502f9478ff395c62154
pdf-font-stream PDF embedded font (sfnt) at offset 0x167AD 21456 bytes