Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed221fffe59b666…

MALICIOUS

PDF

92.1 KB Created: 2021-08-12 03:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2ed143185ed66b499e1a642e25701b05 SHA-1: ad8321baf3f89741a36fbe40f3014c948cfe3c49 SHA-256: eed221fffe59b6663ba264c719e36b3f30673b685e48e2608c9e92f5fe7280b3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting it's used to distribute further payloads or phish users. The presence of external URIs and a link farm on disposable hosting further supports its role as a malicious distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://medvor.ru/uplcv?utm_term=macbeth+act+1+scene+5+summary+and+analysis PDF link annotation
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/tml4td7e9cc11s5v5ui3vhvvf7/folajazogotebimekikerisaz.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/21984842759.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/waxokegupujezutobuluxa.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/6106324801.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/39937005403.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b23c6f36145---57037387026.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/72237645032.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ad17803dbb3---94400889593.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7be7cf5ab---rinoboxoxobimuxujawixisud.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/rawaturemoze.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/pemiben.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/19607467581.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20a8b8fcf---86627704733.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087607a9e0d8---39852404883.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086544fe5515---82384899108.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/83370384092.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/36dbe0eb82d72c86964e14311c5bba58/4074479858.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/tafoketenoredejemafoxe.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/wuguworokefowejoze.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16072108da85fa---56398770435.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/95638062685.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/wezomugexijugel.pdfIn PDF document text
    • 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_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 16940 bytes
SHA-256: 6dcb2dba2cff20c7f59cda5c79943d1a99202034b21a2c8169ba55f2fbaddf8e
font_01_sfnt_off00012f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F72 11048 bytes
SHA-256: 8304364bc9b712f55ea7e51d3cbdafe7174ee229b2185836f966d1d8ce123814
font_02_sfnt_off00014911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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