Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbccfb6c6f6e136…

MALICIOUS

PDF

93.0 KB Created: 2021-07-13 15:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3a708bd50ae565a4dbec15dee10339d5 SHA-1: 367a687359db00ee95dc331d92d5db9e2d7a242b SHA-256: 6cbccfb6c6f6e1365ab892b7125da4d0a08e825f90ffe806072295df0c3ecb00
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://allytemp.ru/uplcv?utm_term=stipend+meaning+in+tamil PDF link annotation
    • http://okzawidow.pl/img/upload/files/vamikejipifo.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/5gf5sfba5a3054ndj7gqfbpe5b/butabedonuvuzuwifewi.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/7308114768.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/96915796320.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ko0jkj91506jajfgb49locqb3k/sogodonezirup.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/mepepusukenodowesunanovaf.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/14367286288.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf864cba0---gopapibopolejumuris.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/ivllr4hblbi057r8rb402len03/49538246838.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/3082185910.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/tkpmcjcd761bri6uaktqtf5v97/28664219246.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/26a5cd3e18edac5c26ab98262e10931a/feresep.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/lumovoditi.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e7f3cf59fff53294a7df72ded1edbc84/38868625306.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/dujorasexewawowiretetonaw.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/resemar.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a790c007d---degikaxamubekofelegiser.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a0c4813de---vujururi.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa93034e756---mulatasonimik.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/bb6c4c9b2b1e7e6da84054183309a107/zerot.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/siguwofefefipozod.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/juzoxivisise.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/mavuzewokokizisazinaxu.pdfIn PDF document text
    • https://bataretak.com/img/files/file/kirosezelulive.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00014627.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14627 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000d109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_02_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 22732 bytes
SHA-256: 78bd3a4733e47c18ac75f73fd20a75003676f4e11b8fcec036a2e8b1e29fbf1e
font_03_sfnt_off00012ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECC 10420 bytes
SHA-256: eaa5a4fb2d88aebcb7a36b0baee0d3070b432345d6a308867d849a753048f8c0

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