Malicious PDF — malware analysis report

Static analysis result for SHA-256 d501678aae81b984…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 05:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3cc96badfc98a48c28cf93013a539147 SHA-1: f7e88c05ebe85f655814c574d1bc93d95feffaf8 SHA-256: d501678aae81b9841dc87649474997d73d622fbf18c4c57174f16fc2f417baba
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms 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 distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://assisdrive.pt/userfiles/file/9683455398.pdf In PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/nafigile.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/xarevesikututobejaxozo.pdfIn PDF document text
    • http://mastervin.ru/files/file/89609821597.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d5bf1d6fb0669c4d5a34c84b1e475591/towimakofozusitafuxuvi.pdfIn PDF document text
    • http://premo.at/userfiles/file/71570192266.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/37038710212.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/japabariruwelazewikebo.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/40479946965.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/77306966684.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/89706567051.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/nuneramakip.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614420d420cde---45078216882.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/23298533502.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/93706647237.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/beromudesenurezodusademad.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/48010734467.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134232a021bb---84775132861.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/87557974635.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/96140468148.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/badudemiwukidenaweri.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/8308400148.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109171626472638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bwv+1056+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_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 10152 bytes
SHA-256: 5d3a4736d77a2e97ebb2c51b39560d962079110ff42ffb38dff351ef4f5080ed
font_01_sfnt_off0000ead1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 17944 bytes
SHA-256: f50fc01e418b55c1420aec65d1466f2eee8109128561504578688d5704b49ad4
font_02_sfnt_off0001198a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1