Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f82491a3125f7f…

MALICIOUS

PDF

93.9 KB Created: 2021-08-01 06:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e91447d96017880e99b533982bae65f SHA-1: fc239a0f764913c0b71650efbc2f1ca134af7872 SHA-256: f7f82491a3125f7f9e636cb2fd9a97ae802b92b978e561f30c35d43e52366e7c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage and disposable hosting. These links likely lead to phishing pages or further malware, indicating a malicious intent to lure users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://hysansam.com/fckeditor/userfiles/image/98143244214.pdf In PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/1511ea2fcc77f13a598ce872033cf95a/13065880639.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a5b8b6b3a---rokusudegetenofas.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e657c3a00e---77223771341.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/36277463773.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3ad54970b---feledefoxizawazujur.pdfIn PDF document text
    • https://educhina.mn/editor/files/vivikejixijefavarepela.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/lonizatovupoxifurejat.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e6da6d534dbc5f0f0e12b30980cf8bd5/80293542860.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/b81be983ba4c4ffc302c74ce345d3b5f/69285194572.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15b8731a10---48966310821.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/65865180561.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/71e04cdf9685b0c23aaa1d71b4526eb6/fenugavanufawid.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/lelitusibip.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/kelokozamumogezi.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/37231284628.pdfIn PDF document text
    • http://cjatkinson.com/userimages/folupeloxa.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/dojafatunu.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/66430799595.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ceuros8ao7d5u4hs7hqecksur1/pazodop.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e417ad8fed---68544592717.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/nelorikatoka.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/21738139438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=marketing+plan+template+google+sheetsPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5D 17008 bytes
SHA-256: 23b5104ef0a566474d4d1d0d5dfb3004f305235e8c9448e157d93746bbafb174
font_01_sfnt_off0001389a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B1 10784 bytes
SHA-256: 39649a0aa841965bda89c75fbbe569cf2fab26ee43b05a46554235c84aa11125

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