Malicious PDF — malware analysis report

Static analysis result for SHA-256 791c879cf5346951…

MALICIOUS

PDF

93.8 KB Created: 2021-07-17 05:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cc1617741c47ec45d98b7f4de79cb19a SHA-1: 1fdf60964e3381aeff51b02dc48a1f5e78773559 SHA-256: 791c879cf5346951fa4f320559afe84484b50aa0344ac9dd3931c4c663e8f4bd
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple links on potentially untrusted domains suggests an attempt to obscure the final destination or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/6ij1g55tl0seo4f4m18315a1e0/93043306972.pdf In PDF document text
    • http://lagunaapartman.hu/images/user/file/jewugibewarudulenoz.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160de60c587c97---18075099183.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3a9755dbd42b5b1aa1a1ed7e930fa198/zivugidevez.pdfIn PDF document text
    • http://hncastlecable.com/d/files/10498283928.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/28210879838.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/2e11614967decb00b01105490098fe33/rowewurejuwuvuvinimokal.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ecddb95e452484846a824586b6d375e3/kasegu.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a26a86045---bupogimijuwepunukepefugik.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/19270299540.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/4816d610116dee0871879f88c8381961/56510080845.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/25313414413.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/58us3lk0d1cng9uuuclhqk5gq7/70437023921.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/gosawizuvaxujojiv.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086d1d2a2920---46994906807.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/mavodatadesani.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f08774c6e5---81956340963.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/96293701745.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/36686805659.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/89686854055.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0f964e22---belasixadatatawu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7da78bddf---zawefikamal.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608948fceb0af---12470131169.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800a1bb9f4e---47528288684.pdfIn PDF document text
    • http://wrhs1976.com/clients/0/08/080801f2a31a95d446b71e9836a5425d/File/91464598975.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/63048314139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=state+of+being+verbs+list+pdfPDF 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_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 17124 bytes
SHA-256: 7b8cd57206f935e00d16ee9f84352d958d55a039148f6cf953a97a9d57a8603a
font_01_sfnt_off0001395b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395B 10956 bytes
SHA-256: f4d986db09b53aff0d106eae3bacb730af75e785f4ddb75d6a7865c62fb9da3a
font_02_sfnt_off00015274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1