Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57d11a9f28d70eb…

MALICIOUS

PDF

86.3 KB Created: 2021-06-26 19:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6fed8d751525f5f444f20ad506671708 SHA-1: 39120e7067f469594ed4f709bfc87260983c036e SHA-256: b57d11a9f28d70eb2ab36ea54d5d9d80f7e5dfdfe3e2b78b7e9aaeea21c70818
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The primary attack pattern observed is the use of a link farm to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/f1cf876eac00cec54b77983f41b14be9/58757132320.pdf
    • http://sl-light.ru/design/img/upload/file/sudedutititerilekekom.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/1bae3d465c274f5583bd3da5da5f9225/luxusipepopapev.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab394a82600---78829053693.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2325633df3---fivutitibew.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/xogufumepekaduvi.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e4b583679123c11eed0fad6d99afb98c/rilux.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/304f6117211414162349e28f3f70ace1/30123836112.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160958b78cfec4---towomizinidiluzop.pdf
    • https://harkakotony.hu/UserFiles/file/216581540.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c6215501d---favutelibabekapogidilaw.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/bmk6oiglmucm0lmn5sg69vluc5/15241320362.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609153989349a---rizexelelavexu.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/db1a24d2bccf529fd25859644a6e8d67/1451755049.pdf
    • http://isagenixmakessense.com/ckfinder/userfiles/files/sadedewogenivolitusok.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a8a257367---gevozisakarufafugavo.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/vn7mg65ur4ptkece5gi1v59821/rawitowefufidinemexad.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/rarujipesofawe.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c06a45346---zofazosasixetexofedixiz.pdf
    • http://abnicum.ru/files/file/53041109993.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc64c6405f---84394174609.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4c0bb9422b1ed2c3bf6596de047aa66f/45253749796.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160be031c1d356---41227405276.pdf
    • http://aucoindeshalles.fr/menu/file/jomufukitexibojaj.pdf
    • http://sola-brothers.com/userfiles/file/rirevadovijifu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=non+renewal+of+lease+letter+from+tenant
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5aede55ca90f4543f3a9b4dae5ae93d4/nowikararuxud.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_off0000f065.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 16792 bytes
font_01_sfnt_off00010877.bin
33e400da7db85c38d483d5d5d4f19b283419978f4b39ac2d4cf72294d1fe7648		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 16712 bytes
font_02_sfnt_off0001340a.bin
5a15f2a235c20db9eab76f5ecb05bffebb1293deb5c88bdac85d9740d1dd49cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1340A 10348 bytes

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