Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76b68612141c17d…

MALICIOUS

PDF

75.3 KB Created: 2021-09-17 21:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9ee65f64e93c28539128d9c0eb2cb8a7 SHA-1: 368510b0944a8b0ca9f2bd25febc911e545ffcae SHA-256: f76b68612141c17d31e9dea9b3125e335bea9eadf02c374c8c7be77a5be26dce
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://philabc.ru/uplcv?utm_term=how+to+use+phone+as+pc+monitor PDF link annotation
    • http://pferdplus.at/sites/pferdplus.at/files/file/16083946981.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/74434cb13798c42cf8bf14d5f5184133/93116679043.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/bukoma.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/tiviv.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613686514e55a---nabujakofirurof.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/gazageve.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/fapokelajifakutezivo.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/56364972471.pdfIn PDF document text
    • http://yepuco.com/uploads/files/palowikuzofilupubukex.pdfIn PDF document text
    • http://suurelepa.ee/data/file/69108762268.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/gogitatobanokatepol.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/fuvagaxabuxofarabogivat.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/53044873233.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/ridibuv.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/sakodo.pdfIn PDF document text
    • https://chp-travel.ir/data/file/79915312856.pdfIn PDF document text
    • https://allianztc.ro/files/file/94970922186.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1b4a432ec---49239379140.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/2100789503.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/14643627566.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/gozulebofuraduxaliragupe.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352d6be994f---gidumoviki.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_off0000c26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 17196 bytes
SHA-256: 157bbaf1e78adb317cf1519a104d6b2b2c95763e5efa05192700cb99d2e9af9f
font_02_sfnt_off000106fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FE 10768 bytes
SHA-256: 51d59ed15174f6319abc98ea97f895f5f4317251594a595dab589e35c6c3266c