Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db2c31339995928…

MALICIOUS

PDF

85.1 KB Created: 2021-07-01 19:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ee2e935ab853bc95a11345761319e1b SHA-1: 7bcf51d91b8872f55943674f890e3d042f2e7286 SHA-256: 4db2c313399959280306a366dfe57e6567dade3f66fd6459888fa40cd6f091c8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of many external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d8e7a1250---gifogizatinarirunuribugaw.pdf
    • http://iseveranscopy.com/upload/editor/file/79096901874.pdf
    • https://beauty-full.ru/uploads/files/40686147000.pdf
    • https://langestrand.se/anvandarbilder/204/files/kujagadobabon.pdf
    • http://appli-veolia.net/ckfinder/userfiles/files/dojotoro.pdf
    • https://walkandsmile.com/userfiles/file/5853649201.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609feffed04cc---wikosu.pdf
    • https://fedico.ca/upload/editor/file/divuxopagobitepi.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc09fe2bdb2---figagilegabejulitozax.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce70446fa45---temolusedugur.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0264287706---29930424636.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/legof.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afdea425e32---sasafem.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ior9kl7kvd47i9uc6pugln5ek2/72397983454.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/12090c8e8c938aa13556d96a4c6b85d4/mavip.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607abf1f24c28---78541903924.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/f9puugkv3fpt902mi956fskfdl/pinikarin.pdf
    • http://amuseonline.com/absite/userfiles/file/vavodufivowaruwalimerafi.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a3ba039fc8d8ac22e88d950cc37c997a/35078406018.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6e15161585b82342cb580bae79d1b93f/sebiredopijud.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3a41cc408---96163062079.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/84425856c56c661de5bf540c9b7fb455/7012578573.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160731c2434eb4---73064327397.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ab8963bc4---mezivibosemuwesu.pdf
    • https://mfdesign.hu/files/file/biputurekig.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a13daa0a227---burolisotinofofelok.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59c4ccaaff---xulubexirudusazapoporuful.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=interment+of+ashes
    • 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_off0000ebc5.bin
9c59f09d47cf23f5dd0ee86d4507e2a54bdc005170f9f79a2b895787ce4f1f2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 16884 bytes
font_01_sfnt_off000117cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117CD 16792 bytes
font_02_sfnt_off00012fe4.bin
c7f5727eef17887c3404ac14bc95b4802520feb2b86e932ea17ad83705cfca74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE4 10292 bytes

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