Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d79799e6720b68…

MALICIOUS

PDF

77.3 KB Created: 2021-09-15 12:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15184ce08217e60a3a0e1db60a31c355 SHA-1: 635678c12f39845c59a4aca332b7b985d3e2a2d6 SHA-256: 21d79799e6720b68fa47fe10ef3bcf8a74ccc42dbba5a1799edce753c6f2949d
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 identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly show a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=world+war+polygon+ww2
    • http://www.wiz-fac.com/uploadImg/file/zotis.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1efa3871---lugowu.pdf
    • http://boldino-hotel.com/ckfinder/userfiles/files/2453608859.pdf
    • http://1night2day.com/UserFiles/file/25373578483.pdf
    • https://ikincielinmak.com/upload/ckfinder/files/59344840364.pdf
    • http://sumtinathholidays.com/admin/uploadfiles/file/8731420760.pdf
    • http://abbeloosschinkels.be/userfiles/file/61697803763.pdf
    • https://uclerbaklava.com/resources/file/57772853023.pdf
    • http://eastcoastbiker.de/sites/default/files/file/23382099924.pdf
    • https://laundrybyconrads.com/nbloom/fckuploads/file/febevigarufipexano.pdf
    • https://gionggiacam.com/ckfinder/userfiles/files/51157977777.pdf
    • https://fond.ru/userfiles/file/42391725691.pdf
    • http://dulichgiahy.com/upload/file/gejarexiz.pdf
    • http://tabletopad.com/images/file/93221182390.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614170a09f846---84888262171.pdf
    • http://sportingclubalbinia.eu/userfiles/files/805484667.pdf
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/77909493643.pdf
    • http://status-go.net/gfx/userfiles/files/75372529574.pdf
    • https://comfort8889.com/upload/files/5277500319.pdf
    • http://www.lircai.com/web/inline/file/tidepojiro.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/jazinuziji.pdf
    • https://hatinhjobs.com/upload/files/bugigenopowi.pdf
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/55072517222.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2892d452add8fcd88796d668f15e9d4d/90082766465.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC72 16792 bytes
font_01_sfnt_off0000e489.bin
ed9f2316cd5b0a07aa0c9340ea7fc2c8f48fa057191e37a87e843d3aa46998fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 10392 bytes
font_02_sfnt_off0000fbfa.bin
5cf8589e6f4c8a311c33939a607a15780446c7a04b5a1a8b43529a7a72422204		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFA 16836 bytes

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