Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49fbe083d99bcd2…

MALICIOUS

PDF

90.5 KB Created: 2021-06-25 15:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 839c567452f089f677054e57d834afc6 SHA-1: 7c7045cecf5bb41632e55669badbe92baf2ac0bc SHA-256: e49fbe083d99bcd20110c4fc2d65e95a51c1bc9955e3f5ec424eba83a9a55ec1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://queure.ru/uplcv?utm_term=pdf+to+ppt+conversion+free
    • http://omgmediatank.com/userfiles/files/xokaj.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3c4ec575bef0a1bb28f18a8bdb461637/63318129260.pdf
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/29007492867.pdf
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/kutanitijulupebawuduni.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d62263c67e---89998130289.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/36593658174.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ec97de2c7---kamim.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160850f4ab93d5---40176496884.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/53f6f814b14b897fb8ac23b5faabc2af/rururenukidakufi.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f43ba5030---1878075249.pdf
    • https://editions-tlp.fr/ckfinder/userfiles/files/zekozukabapizov.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/s746jddus78pp24nm8k1d8l0pd/5873443135.pdf
    • http://www.alfapilates.pl/upload/file/fimidawiruzidesixiwuz.pdf
    • http://n2nlah.org/UserFiles/file/jijifap.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c0775d40de2---58202515037.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/2e471c046df2f172d8025db669b9a3fd/nalexowapezadanolonebotog.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://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_off0000eb3e.bin
d8594745ede8939a83625b664f14d8567f7c8326553092602edcbefcd92083c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 17016 bytes
font_01_sfnt_off00011775.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 16792 bytes
font_02_sfnt_off00012f86.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F86 16144 bytes
font_03_sfnt_off00014506.bin
a74ec824e71ea0f16e8c4582517c5c19609192ec071ea1bb1d2930aed5ef19d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14506 10472 bytes

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