Malicious PDF — malware analysis report

Static analysis result for SHA-256 110746149b86abd6…

MALICIOUS

PDF

91.5 KB Created: 2021-06-25 17:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9645960220c63e17ba32a0e1fb31dc8b SHA-1: 7c2cf42752362307b015320327169f4b01e44dc7 SHA-256: 110746149b86abd635e5262a725e8c0bb1b4265b882cc3bde2298341868d7faa
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The document body is unreadable binary data, providing no direct content clues, but the overall structure and URL targets strongly suggest a phishing or exploit delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://irlanc.ru/uplcv?utm_term=different+types+of+braids+for+men
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5b3a767a9---39889650917.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/na2tsjiocuf1nurjmq0cog2311/vutiduduzejeduvag.pdf
    • http://gasthaus-steinkirchen.de/img/editor/file/jigejatozojotobifek.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f2b7d8c7c217c4b0601eb35f6b93bab6/29406299171.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c7903120---65331288784.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e1a6dfb22---7068345015.pdf
    • http://school19-zav.ru/userfiles/file/56924410449.pdf
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/lagarutavopavonese.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f224c52ab---mobevebijunuzowodure.pdf
    • https://mamo-tato.ro/userfiles/file/notukorasukizogovemojode.pdf
    • https://alperbehang.nl/userfiles/file/92179125667.pdf
    • http://wmc21.com/ckupload/files/89649188502.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/e8fb8d29c38e48e1915fd0c530a57565/5214839611.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/roverugi.pdf
    • http://trans-serwis.com/userfiles/file/goraniliwudej.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082bd7f07d35---89255405051.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/jf9nejl26i5l1qi1oe5avobae5/24020508676.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/pukue3uo7c6htv8hu37fhia8lo/77535625731.pdf
    • https://centrorevisionimonregalese.it/file/58557256075.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6ca1cc78---98206104226.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe9ea3d8b3---kowuxupowej.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8ef33258f---39290077993.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cff2f3d27---88488704394.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/0110fde05a77ce8c14d1d876fdf5759c/zusixasunenesudodi.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825693d8fbc---tupemulubazovizuvuzalife.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_off00010462.bin
c95c3315acdaa29169e2d39ec7826e15bde7ebeb87e0bac9391124efff7bc6d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10462 10868 bytes
font_01_sfnt_off00011d4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4A 16792 bytes
font_02_sfnt_off0001355c.bin
070e519edb3a3e4c6e18188cb9c67b452054b6be59f29a8e3580397af9aa19a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1355C 16672 bytes

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