Malicious PDF — malware analysis report

Static analysis result for SHA-256 687621b7054b2868…

MALICIOUS

PDF

70.8 KB Created: 2021-05-01 12:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c758a1bcc243b7d7b29de24abddf95e SHA-1: 1e490fbe3a3ca0f7ba6b27c40b50ad53dcb49f1f SHA-256: 687621b7054b28689c9870ead20822f85f3908c976039261b0f5a86c19f56a37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress upload directories, suggesting it is part of a phishing campaign to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and contains what appears to be junk data, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/64b5ae92c089f6c47ec946acf94cec72/9456172831.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/71282028565.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/3adb7e5e2f7635d018073db140219f60/33777616011.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4247284e7---99222843679.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/31d2c86644e3f9bc35eb8bc13bcddaf8/xejawavimiramepuketoke.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607204575fefb---voxukodoruvanik.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/902f87535dc18490481596fa52d14028/11385337067.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084310f75870---57614587727.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7a935cb1f---46794968522.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085155922769---42588794812.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd66221d5---wujaxitovavunuzo.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb8d7b0e6f---73315475207.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080f90ae5f95---22007845858.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/1b9b58ec96e185b28b50f0e2caeb6bec/gedunitumisukadej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=counter+strike+1.+6+warzone+2014
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608519e5bef2d---53138140733.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f2.bin
932602c3750245f680520f69114e307eda7592b3cd195a2150edbdb04b21ddbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F2 5356 bytes
font_01_sfnt_off0000eb60.bin
78851edc0d8eded7c52e5d946ac52f6a634f953983bfa07963f2d0cce28a10db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 10288 bytes

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