Malicious PDF — malware analysis report

Static analysis result for SHA-256 e457172d8ce2aa4c…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 11:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a34eac439b3f956977a9d7821e1b27b3 SHA-1: f6149a3322403eab2912f4d516e1fed9e55bdf6a SHA-256: e457172d8ce2aa4c4ad630bed95dc3d89ceaae2f0b897c027c5a9d873014b813
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm directing users to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of external URI heuristics and the nature of the links point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/36262199974.pdf In PDF document text
    • http://goldsunjsc.com/upload/files/16840295957.pdfIn PDF document text
    • http://spakimthi.com/upload/files/2732617643.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/woruzorenumur.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/73892625376.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/mosuvibupugilujiriroxisag.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/s3nchbsv02emvu93738ro1vst9/98998289099.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/pisip.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/45185496959.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/diwozakekejuvavujov.pdfIn PDF document text
    • http://ashioke.com/images/library/File/xagapajozopaf.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/jixopojamup.pdfIn PDF document text
    • http://machin.kr/userData/board/file/bedowapelomilexuw.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469400608bd---68187347603.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/20049742442.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/57367930156.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/xojitisitorirexubufog.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/rirutegolodekov.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613260dbc682b---vuvefol.pdfIn PDF document text
    • http://quetthe.com/upload/files/karotavuw.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/tonozo.pdfIn PDF document text
    • https://1am130r6h1n1-k11a7.com/contents/files/66849582619.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/golugosoka.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141e28ed3b72---98959455678.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/9042434594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=king+of+fighters+apk+98PDF 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_off0000ce16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE16 19056 bytes
SHA-256: 868296316750a4bcee64b311e63170ef5d3027463ca1052d3f763d783942e62a
font_01_sfnt_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11791 11052 bytes
SHA-256: 5efdd9f9786bb84de4a16ead919c4322e117fb0767bfd588b75d6983232d6652

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