Malicious PDF — malware analysis report

Static analysis result for SHA-256 052a6bdd4de75c26…

MALICIOUS

PDF

89.4 KB Created: 2021-06-30 01:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb52476e4d28846cf48265680442dc49 SHA-1: 0ff8dfae22d0865bacab7bf3669af1ed2973b1d4 SHA-256: 052a6bdd4de75c26edc3452857a19cc5a34a6a583e1cc9dea90f298648c0ffa4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve to redirect users to malicious content or download further malware, aligning with a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/975d2689f044a6fcf1bae8468fce097a/44607407385.pdf
    • http://gleneaglehoa.org/images/file/tawamajavutate.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3c86ae636---21816245756.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bf1c8b33b23b3debc05cc239a141c943/73403189464.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf915fdcd---13912007136.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/71e22db762d96da99a2cc6cc587d9368/fulefenunamesuzumozerin.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e41c885f864f1c93db806217fe469d4f/74415312301.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9afbe390ce670c649a3a5ea3b0e14aa7/69059156738.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ftnqmac55dusdlhb9disqpd9s6/78604004845.pdf
    • https://podereilmontaleo.it/writable/public/userfiles/file/vudorit.pdf
    • http://simonhoirup.dk/userfiles/file/sumixopiripiratu.pdf
    • https://accuratesearch.com/userfiles/file/36838632452.pdf
    • http://cgl.lu/userfiles/files/98081683865.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/9usq2qnj3iunh1reu5mbig6sd1/90603938124.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/29615061981.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b2e9c8353e0c1a12505f4a3796d00a45/7361779006.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/32eda2cdba59a4608ca2bdb0c723fcdf/wujetivuwuzetize.pdf
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/74920568985.pdf
    • https://camelcarpet.org/d/files/64768568975.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/semunofuzova.pdf
    • https://agatanorek.com/files/file/30954609015.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2a7881f40---99919134012.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/a38f04c0ecb7ce8b11e5f4398b024014/5801404431.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/bd1e640b14fa483d809ce39d7a636856/zesuroramusabibimeva.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/qplastcea534pg0sgq7guetoeb/86810638728.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072a0708e13a---ruvoxumidawetuse.pdf
    • http://auburn-properties.com/userfiles/files/80532778793.pdf
    • http://hsi-international.com/ckfinder/userfiles/files/sifujagutogef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=wolf+of+wall+street+full+movie+stream+online
    • 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_off0000f996.bin
d38e200c078c84ebfdd34e273bf637706a4b98877cb6116eea4581fc4b0c9813
pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 17540 bytes
font_01_sfnt_off00012794.bin
7d8ebee718cce77ea55c24478c909e257e6d64fdb1d7b28e034155d658e0f22f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12794 10620 bytes
font_02_sfnt_off00013fee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEE 16792 bytes