Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3dc9dffcf1c331…

MALICIOUS

PDF

72.9 KB Created: 2021-07-13 23:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f641234fc8babb528f7ec757742984a9 SHA-1: 4c335e94ef11129cd2560477d59c824eabacef27 SHA-256: 9a3dc9dffcf1c331e5f39025bc0c896afe5539e86ef923b7066ec3f7b7af601e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting. The document's structure and embedded links suggest it is designed to lure users into clicking through to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=autocad+tools+and+functions+pdf PDF link annotation
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160913ddd69aa3---67478543530.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/82351394872.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/jajenawabolisiwawojaroriz.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b470bf316eb---kibetizi.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8f40f653953d9887bcd8c7ba68681d4c/zumoda.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa0fa45eb---nanako.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/65055821092.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/biwofazuxa.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f1a387e87---zufadaxikep.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d5a76da2b8c8576e6f74b0bf95cc3db4/94198268102.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/jewukesilafefosaf.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/526b12ca612296e6ee34d4c1d7d0a802/61223326756.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/34583904108.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d496186db---43582680537.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/nukonuda.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/4a04f1092fd083636ded25e9017b456a/71555334552.pdfIn PDF document text
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/7296486552.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2944187b2---5352956413.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/7167e878cceba7b9d4755007e92860df/73239881312.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d17d9e5c6c---99990212797.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/54578995647.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/65603644238.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/vibetinijuposexuwateb.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dd034eff2---83059089071.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abf46c26d6d---lanilewafibizikelovumi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C0 15480 bytes
SHA-256: 6a4020811be7332b900d6e988fdb152c126d4aaef2fa0d3bed235fde356550e6
font_02_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 10460 bytes
SHA-256: a1f587ece1fafdbd99390d08fc3cfb0cf4030d8e494a942c6744c43201e6c235

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