Malicious PDF — malware analysis report

Static analysis result for SHA-256 af49ef3bf35ad054…

MALICIOUS

PDF

71.6 KB Created: 2021-06-29 08:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83ca0aadbf8da743fbb93a525316517a SHA-1: 25f020e184ea2c12ece3c19813b029f63889d3e6 SHA-256: af49ef3bf35ad054d85ed866cf1693b0df51e143a3b9c9e44cb9879fc8941f10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=1.2+3+electrical+circuits
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082bd0fd0382---gopagikun.pdf
    • https://alternatifhosting.com/calisma2/files/uploads/pivob.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faa9dcb92c---firukosavaxugolexaworize.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607537afb8ef4---winesadora.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5ae006f0f---63245407442.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/jajibinujib.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d17bd89ce47690bee181b8ca13576c80/koxuse.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/db8d9e7af85de7f542fd5cfc097d5dce/gobisonilixesira.pdf
    • https://minhkygroup.com/luutru/files/34040063095.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070784e8ccc6---sedikuxuwi.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607434e36dcd8---41929649570.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/b79f458f8c2c828b41a93ad33ee3db58/79198701427.pdf
    • http://silesiacapital.eu/data/file/woxosivajedowapazak.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f77edf74508b0fb61991ac79032e27a9/59206458691.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8ed8a134995a7810b007edf0873d5544/jinurametijusukilevikoda.pdf
    • http://ahchala.com/img/file/varoniso.pdf
    • http://curry-box-deluxe.de/userfiles/file/1584642028.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbovd6f441uh7mngvsnuvpn5en/80131555581.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a06903032---jovew.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd171955c85---zogudeviribab.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c940da9a14c---fomorugosopokejem.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4b5d903033ee85b6f5162ee0f9404828/37646127742.pdf
    • http://noxsun.com/jingkelun/userfiles/files/20210617131708.pdf
    • https://narimasu-chintai.net/jcfiles/file/44249123086.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796c3206494---dijagesenefejolipolavozi.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_off0000bb29.bin
9609ffad9ed4dfe9a6bb210d851e29d8e659fc704d580f1bf30fa78821c1e45c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB29 10412 bytes
font_01_sfnt_off0000d2f0.bin
4505a620dced8c81f4ff758a53247b2d5064a54a4f5ed3c3fa6807c1b126ab19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F0 15344 bytes
font_02_sfnt_off0000f91d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 16792 bytes

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