Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63a18346f154582…

MALICIOUS

PDF

104.5 KB Created: 2021-09-02 04:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0fc44692eda1bd5b3b5d94f1bc9e87a0 SHA-1: 05390358a74ba3af933cd1a6f16f469d6681acef SHA-256: e63a18346f154582c936f8ac35a30aebb24bfa136e424dc62299d835650578cc
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. The primary attack pattern appears to be directing users to potentially malicious external sites through a deceptive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://rubensova16.cz/files/file/88965887737.pdf In PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/78648128206.pdfIn PDF document text
    • https://samowar.me/userfiles/files/90868315776.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9f966c3fb---24009254286.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086959b292e6---kirefigaxuwuduzori.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/dc757c3888645a9ce9426fd0ff5ad741/xivusesed.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/sl213kqe7t612tbiv5a0b6oh35/safomovaruka.pdfIn PDF document text
    • http://rafaelokazakov.com/file/92288434602.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/xitazi.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c923d6d8c16---42466506059.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0fe1102af---gisarenuvinimezaboju.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/kidegomiron.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/liop2dkctogbgqssptrejmcchh/bojotijetelozux.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/94261373335.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/rojido.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/9dc42e21c39e4d1ccd03868d03dcb57e/soxunexure.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/abd6f767a67fc62ede29db8f14ba49fa/biseviwirijujomawefuwal.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/rufepaborevin.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/taxolupa.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/dofap.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/84468487103.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/kk57idli9hevo7ieuah027dtke/99524732748.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16129a5426fff2---mejezifosigilobafusifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=great+things+big+and+smallPDF 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_off0001320c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1E 19276 bytes
SHA-256: 23a8573aba98cc3d873d8918be504174de5400bd440a4a6d7e4ae17490448ad1
font_02_sfnt_off00017bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BF2 10756 bytes
SHA-256: 3a4fa632218d57710144eb16259a9b231e2eb5d918a616cc96681d2628f4d1fb

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