Malicious PDF — malware analysis report

Static analysis result for SHA-256 8788e81f47477760…

MALICIOUS

PDF

91.9 KB Created: 2021-06-27 14:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06b8f5de30a989fa11d10bd9e5dc10d6 SHA-1: 3f52f1e8479ff464189c991e6322bb16fad5d834 SHA-256: 8788e81f474777601cc96eefb5804ec34f374c1607527ca4b20a0cd52fb9236b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on compromised CMS upload storage and disposable hosting. These links likely serve as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://cafemocion.com/userfiles/file/45723773293.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/c33255c747bcf51a1ca5ac91d2a6ec8a/tenirububebimefokavuzunaw.pdf
    • https://avgdesign.com/userfiles/file/96417290440.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f9ff47256f637b86eb470ee253583bec/96684686413.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aea7e882c---70269919705.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160809fb7c00f8---duxoman.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a0d2694b9---53830485410.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/45ef6dc774da9d40a605317e04bbf06d/46953061896.pdf
    • https://ncvpte.in/userfiles/file/97734319638.pdf
    • http://bobmeetin.com/media/galleries/files/91270198402.pdf
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/85596915971.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e7dad704d0ba46ac19058b34b46f49bf/kupibizazipumu.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160765d1d8a257---52983934104.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb744672ac---43236732392.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e2733435958b2ccad2166b361b2e9dca/94184540452.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210607_E3BBBA66AD119CC0.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/70608061497.pdf
    • http://dinskayarealty.ru/media/file/98041523925.pdf
    • http://alexhofford.com/temp/files/file/20627390091.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a710049a5b4---delosesozapeniladugujaza.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fujq1i8tu9577fq0hsfrar42k6/dorivaz.pdf
    • http://myphamhelios.vn/luutru/files/96236429189.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8ac16a648---97873123235.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a2be2ed6e187053f9897ee80d8d36b3b/jegareba.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=whoops+a+daisy
    • 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_off000100fd.bin
325f4ef657b62771639081572d298f28e5e25c180775acd35969c2ef73a58bc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 19884 bytes
font_01_sfnt_off00013398.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13398 16792 bytes
font_02_sfnt_off00014baf.bin
153f0f2dff66adbaba7b315918d90e48b79bb363795a957b70f795b8f9ea5b86
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAF 10116 bytes