Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc94e6c6b11f603…

MALICIOUS

PDF

70.3 KB Created: 2021-09-13 02:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ab81937de1ee11f91c99e31f88293eb SHA-1: 9fd04cc6750c3267621c70c29f2164f28df27003 SHA-256: 4fc94e6c6b11f603705210d53376d39981f28bd88e1b49777e1d4d4e7a578321
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hiredriver.com/uploads/assets/files/lavomowo.pdf In PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/e6da0a03583ad05531a07fae6217e9e9/kozoduwuv.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///rebowulimeke.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/64328669829.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/nurozalurudonipo.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/73141347051.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3ed678712---galigugamola.pdfIn PDF document text
    • http://fluorescent-training.com/file/77274660219.pdfIn PDF document text
    • https://mediaskills.rs/files/88932105.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/goponi.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/fobodewogekunaregijuzad.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/88389852902.pdfIn PDF document text
    • http://usateatop.com/_upload/files/11003421290.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/36923356145.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3f794b0eb7baa88cb36b14179f82a507/sazoruda.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2073079ee---59284632090.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109061550565986.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/ruzefafuvakejitavamulabos.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/simozilakipopikideg.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/doragugotabum.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/javebonoga.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/loxivesonejagerodu.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/beladuwirubebos.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/mimibumuboduxesapekutako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=talking+tom+gold+run+mod+apk+all+characters+unlockedPDF 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_off0000b3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E6 14876 bytes
SHA-256: ca13df51afe67793f07065306d7881042307f528857e0c6d44dc26f6fb1058cc
font_01_sfnt_off0000d9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A5 11116 bytes
SHA-256: 22540b4dd06e9017498dfbc3063abb79e867554f6cb8caa38fed36e49289727f
font_02_sfnt_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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