Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e98d3a221e5105…

MALICIOUS

PDF

82.8 KB Created: 2021-06-29 05:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c42862fba79f2c058476427edc3ee86 SHA-1: 6291cde3c26ce2590900d64d153b1f96a8b2c117 SHA-256: b8e98d3a221e5105194473a6ac776cf23687163eb1f55b97762f760365a71c21
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 a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious sites. The file's creation by wkhtmltopdf indicates it may have been generated programmatically for this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cructi.ru/uplcv?utm_term=malafide+intention+meaning+in+telugu
    • http://traiteur-ribot.fr/userfiles/file/wumozokewoxunumato.pdf
    • http://sam-global.info/files/file/45226298899.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb62d6f93---lodokuniwivuxixiwarevopu.pdf
    • http://voxel-avocats.fr/uploads/file/60994286221.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076164888710---lejoxosurajirolu.pdf
    • http://apsara.ru/userfiles/file/nodedamonevewazijaluxab.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/bgrukgsn57vvqi9gc3hdsb06j4/16854524898.pdf
    • http://andlupa.com/userfiles/file/nobunofagujuwum.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c307c75df75---37398578778.pdf
    • http://alimentosldm.com/userfiles/file/xagilojoweximunugux.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0a5490409---fodefojibotuxup.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/t5carjtgp7escviv8o6a9b0v4c/96747062714.pdf
    • http://ideas4mypool.com/userfiles/file/98077977005.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/mcdc20pjdkeaj9mp3gql5g4nnn/17439067227.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721790bf8cb---fexememijidiruzolalovaxi.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63930a3782---44226794002.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e9ccd09ee---wukek.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/ce99011adbb1d07ccb24b746cebb3b8f/fowodu.pdf
    • https://fruzsiflame.hu/userfiles/file/tazekidilifaxefagapo.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160751ca80ddd1---fogato.pdf
    • https://fenixfalt.com/userfiles/file/12585269814.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/qa8qr185imj8t6ldcolqmh5lu0/47964818642.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_off0000e072.bin
cdbf3f9e456d3b467269d914b191301a5297f2b35c5a3d784976c455d5a49106
pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 17424 bytes
font_01_sfnt_off00010c8c.bin
bf58a354b462499511368635e2ac81187dd2aa34af3a888daeafa8d4b6411eab
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 10520 bytes
font_02_sfnt_off0001243e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1243E 16792 bytes