Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f1d0eb68e7cc02…

MALICIOUS

PDF

98.7 KB Created: 2021-06-30 18:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19908cba89e572a202833a8ee72c3fb2 SHA-1: 2fa6a82a7add61b99890febf5fc380100b6f0e15 SHA-256: f3f1d0eb68e7cc02d2ddffa2c7e9a53800ddb499fce5ec7fa234346e830be0f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The document contains a large number of external URIs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links and the ML classifier output strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/uplcv?utm_term=stardew+valley+prismatic+slime
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/aeg5tm5ctf6f13390au8uh75ut/dalivifesagajapazugirik.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc7e4f170---kajefekulugunupawupi.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ead89d5ef0ab0fd578b19529dfcdeb7c/mutadanafob.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/82114af1a07622a0b3e14594c74c0e17/42847918888.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/136c7673911567751d36b34cafe6127b/40303416751.pdf
    • https://evergreencans.com/userfiles/file/39545280659.pdf
    • http://zuche0551.com/upload/file/5979320980.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/fduamn5pkt9rfipc6c2gtqn0il/savuvawupukej.pdf
    • https://aiaciran.org/cache/fck_files/file/90208854719.pdf
    • http://elturo.ru/img/upload/files/4950368793.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/52c67c56320a589db6e04cf1b2b85b60/91123383965.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f99952dc8ab55c6f4648ac16c3ff3b1a/91941221097.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/e79ce1ec057c9379c3101a86d2525458/zanoguzesetiner.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace9fc88ee6---67803270125.pdf
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/99052871548.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4752017bc5---fuxoxukotexowar.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160778a89765de---zitebawoj.pdf
    • http://szentdorottyapatika.hu/files/65943465456.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc12755cbc4---rofovusigepulamibolivaj.pdf
    • https://aplusadvance.com/naver_editor/data/file/46776157062.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081fd427a9c2---99359614473.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/776ec8863563d34e121647c43798b944/7339264211.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b630130f4f2---bijazobixunu.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732f2f6ab5f---65902300694.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e87f4975ea---xokuxasakudawiw.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c87328ba028---63571736320.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_off00011fcf.bin
74b52794818c87813fd64afe0e646e3cf3376c178085458e3201a13ee90ce01e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCF 10792 bytes
font_01_sfnt_off000138b5.bin
8bde67018776433e04d5e2f3de959b92bc5066f5c81fd1982290ed7a4ccc8175
pdf-font-stream PDF embedded font (sfnt) at offset 0x138B5 17096 bytes
font_02_sfnt_off000164f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x164F2 16792 bytes