Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9459a4bd9ebee8…

MALICIOUS

PDF

88.3 KB Created: 2021-09-07 16:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 501887734eef308f7d83acaeac5a3bfb SHA-1: c73dce3e8c94fd6ffdad7dedf873a92ecfcba92f SHA-256: 4c9459a4bd9ebee84c76629f6f019809bb3f383078f7aabb6fb3220ce82f77fd
196 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including an ML classifier and ClamAV, and exhibits characteristics of an advance-fee scam. It contains numerous links to external PDFs hosted on various domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of compromised CMS upload links further indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://palcev.ru/userfiles/file/41978543660.pdf
    • http://originalcheck.it/public/img_admin/file///20129755942.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52ec7a46c6---fuwawozelududewob.pdf
    • https://4of100churchstreet.com/assets/media/files/fakebujakejejezukobavoxad.pdf
    • http://fedime.org/imagenes/wolevalivetazakiraz.pdf
    • https://etimes.mn/uploads/files/93866826929.pdf
    • https://jagamimpi.org/contents/files/42858691971.pdf
    • http://revucue.com/ckfinder/userfiles/files/nukowilegeravejewunata.pdf
    • http://harasim.cz/uploaded/files/30996530765.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608258beeae38---ronixagojuzadubosedapopol.pdf
    • http://bigxra.com/uploadfile/file/2021061002053373499.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607defd17094e---11954222654.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbd87c3138d---nuzagilobamowi.pdf
    • http://reikihaus.com/clients/75291/File/61896400595.pdf
    • http://sirmamedia.com/ckfinder/userfiles/files/51518024628.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/o0p7palns84acrj73vneakoscl/84929020757.pdf
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/zixoma.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/413098993cdb2e8f73505d877f349d1b/mebog.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/8goqat9no46em4m6vnmqidtbm1/62435696717.pdf
    • https://momsgardenfoods.com/ckfinder/userfiles/files/69551381428.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/915cfaf89cdb1e3b7d4d47b718cdcb21/83663413787.pdf
    • http://go-pxl.com/uploads/files/ralalibobitegafimad.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=stephen+wolfram+mathematica+book+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_off0000eeed.bin
efdc04a170eb1e55e04f101db06349a2fac982e5d6600d48457e9799dae1800b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 19660 bytes
font_01_sfnt_off00012199.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12199 16792 bytes
font_02_sfnt_off000139b0.bin
848f5d762686a6d1fdb2372339e4e485a679070360f93177f9dc730f7526b9dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x139B0 11112 bytes