Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78652e204548cdf…

MALICIOUS

PDF

91.3 KB Created: 2021-07-09 00:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4f5d5eddd708fac46663150fc1e3201 SHA-1: 8d5a2cab282d0fdabb86c65b7a91a77b387e68c4 SHA-256: d78652e204548cdfcda325f4fd3388eeda5d06b541130fda8e5e176530a3bbc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The presence of embedded URLs and the structure of the document strongly suggest a phishing or malware distribution 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 http://gramercygrand.ru/files/file/62568998601.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace45c01fd9---94115705997.pdf
    • http://jhroseclassof77.com/clients/45984/File/pufibuxetazinoxiv.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e6fd20446---wonudovulewes.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42330dde89---96626295073.pdf
    • http://beergolfers.com/blog/images/file/daripojuwotemove.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d75561dd36e2d243b081de99d55a196e/11709258065.pdf
    • https://avigailpekelman.com/sites/default/files/file/deraginoparipuda.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/0617ba3b42325fb75cf1e6c6506bd2d5/616740136.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30a9a824e5---kukorusunamoribopi.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/jifexajovasatewuku.pdf
    • http://smepil.com/ckeditor/userfiles/files/pifodibutiwituwovi.pdf
    • https://buka.ru/sadm_files/bivakigurijexarazorire.pdf
    • http://al-bandak.com/userfiles/file/subujasumaboviliv.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/305a9bda834362b00f0d617dcc0e0294/81799524427.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160864521b8edb---kutasarigoxesirojowe.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/an2nfij8msf17hha41g08q5b6b/12670038006.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a570e5f42e---53192523639.pdf
    • http://renovfab-menuiserie.com/userfiles/file/rapukovos.pdf
    • http://dwhs79.com/clients/15834/File/gabafur.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a220b17ae9---84828218375.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d83c79fac---69281730338.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e20481e274c---gafuzenesemusuposazi.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16090aa6e8c6d7---53644524536.pdf
    • http://alacarte-design.de/userfiles/file/nugunadimedumade.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+roblox+robux
    • 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_off0001046e.bin
af0c1ca4c5f44df3a3d23ff05d62d4bce262d5b45c8a2ffa54a684fe77fdb85a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 9860 bytes
font_01_sfnt_off00011a40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A40 16792 bytes
font_02_sfnt_off00013252.bin
c7fb8186bbd86d0f7756fdcdde9dc74012e58f492996f7f8473d912d900ca343
pdf-font-stream PDF embedded font (sfnt) at offset 0x13252 17464 bytes