Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b44714cf766e023…

MALICIOUS

PDF

89.9 KB Created: 2021-07-06 19:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1b747e310434e775733d9538fc37461 SHA-1: a035d7de7d97d45889df88d98f63e2441b8fe9a0 SHA-256: 4b44714cf766e0230baa2c857df7775e7f4f5d0889d52e38bdacb90e9aa5daec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URIs, many of which point to compromised WordPress installations and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://synerhu.ru/uplcv?utm_term=literary+elements+of+creative+nonfiction
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e95821469---79301055066.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2073dcc56---nobelutunasom.pdf
    • https://eminencesolutions.in/resources/userfiles/file/77250695371.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1da704d056---1976251420.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086d1be9ee58---masorukapunomopoxa.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b83cc9c064e---duxivimeworotutizofipima.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/i4orvughbnkeq8ktu4v7pg8c60/tebugotazuteliruloxoxow.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607262c8b1503---67187093033.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6858d1fd7f390222a7a79cf62e1aa557/73954400051.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/f00ca8b1594c8ee1cff2a2128224f605/bixabajodimexiguworux.pdf
    • http://bestbuyfromindia.com/userfiles/file/3302021233.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609de658d6098---wiwigivibufugezonovemese.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/5b06568f105e3e6a7eb20b3e5f06f60f/70104303782.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05451327b---24220869081.pdf
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/dejiboviga.pdf
    • http://seabeachthailand.com/UserFiles/file/24396117102.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/1a00051bd52caf651083447de1a85778/tuzorawomovesuv.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091a389d7097---webubuwunoxifitonetigu.pdf
    • http://www.jindatunnel.com/up_files/file/75518177861.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/lppp07ob15hir3aa0dt78tqj9h/53868345824.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/b17399a08232b1fff0898d62ccfa14b7/wofevabetiluf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc1e.bin
035ecf8756dfbdb467ff5d46f0f525da0fd550bb187d875e9f59349d5302b4de
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 17832 bytes
font_01_sfnt_off000129ef.bin
bf7dba8d7eb7ebd9f58c9d163e58fc4edeb3d02d344e0c0cd749ed5e8376ab21
pdf-font-stream PDF embedded font (sfnt) at offset 0x129EF 10632 bytes
font_02_sfnt_off00014250.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14250 16792 bytes