Malicious PDF — malware analysis report

Static analysis result for SHA-256 514f91d9aef989e8…

MALICIOUS

PDF

75.9 KB Created: 2021-09-04 05:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 29de186fa7fc890d6ba2d931c0f4ce07 SHA-1: 439f814d7c6d2e9fdaf247e2ef706d45eb1207ab SHA-256: 514f91d9aef989e8d819385a4aed1b6e5ca54fb447e8078d40e511ef2edc1923
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. The 'SE_CALLBACK_LURE' heuristic suggests a potential callback phishing or tech-support scam context, further supported by the high ML classifier score and ClamAV detection. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://megalightgroup.lv/uploads/files/51891017373.pdf In PDF document text
    • http://doreenindiatours.com/userfiles/file/sokuvuwavav.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/mk2hitjg2g0ii0nln76ecu2dql/moposigemixufejufivip.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/34356629848.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/220113057621.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/tagudanolewatijafinulu.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/guzufuvejedox.pdfIn PDF document text
    • http://koala-al.com/d/files/sinutuwubujejasagatu.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/35198568541.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/rumofojiwuxibopavot.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49880330ae---tizadovixerosut.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/40564981876.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/vuganepajivunoduzafamuv.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/72491542976.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/33149258784.pdfIn PDF document text
    • http://podarox.ru/public/files/bafexalavopefibog.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/bivuleworozobigini.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a93f0b9921---75158206410.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/55347427203.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610da50836a35---55490192032.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/28661768213.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/pemomafanamezefonan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=is+456+pdf+archivePDF 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_off0000c5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 17088 bytes
SHA-256: bf750e36915aaae7cecad01fb9353ef61594a65b39b85ee7f90454357c35964e
font_02_sfnt_off000109e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 10744 bytes
SHA-256: c6cd5d991349c07e8857e0d83ead862647f546336ae8685fdc22698ca2d9c072

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