Malicious PDF — malware analysis report

Static analysis result for SHA-256 337bd187ebbd763b…

MALICIOUS

PDF

89.9 KB Created: 2021-07-06 21:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e0fc03232d2820108c8d233ed92001f SHA-1: 708aa1582a64926eff96c30bfdfad0d662e0f370 SHA-256: 337bd187ebbd763bd23abb2258ad180b71f8a1cae0d1b72fd5c1c29d00b799d0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other 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 analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://himalayanthailand.com/image/upload/File/vovadujiledavijulovubop.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608200ea87e66---jidedezune.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/c2qpoj3180eo0h2kjkabbmobkc/77152083161.pdf
    • http://carszana.com/image/upload/File/kagofiwigajijunak.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-5/20210505184600606442.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/8351e3288ffdec62e77be841216a2bd2/runadosigenesonexejubub.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609618234fcdb---14801729127.pdf
    • http://acecaalcoy.com/userfiles/file/nidulevuxefotefosekub.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a08umkbt7lcq68dtm977qfms44/wofalokutikeliwebajaji.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc70deeea58---mabanadutiwib.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd3e21ff04---giladaboletunipifex.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/l2js2alac6lajdh5mqv943v0a7/vuxoxedowabapotar.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/f582c78251895e38fe585922ef404844/jiwomunasobavasaruke.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0333cbb373215da11cd2b759f10f5d3f/dagelugolakis.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/1cdc62nj93dnnnc2ltcotu3h70/56165337643.pdf
    • http://aristosaigonhotel.vn/uploads/files/majuzomubavited.pdf
    • https://eobliecky.sk/userfiles/file/terifakerivajujejovosa.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/94771423276.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a246e9d740f---widurukavumap.pdf
    • http://pinxedien.net/upload/files/34945180215.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/decaebb52f2b9e01f6bab2be1280cf50/naligeber.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a600a7d3346---jutokozumezo.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d260563da---28106413806.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cost+of+1+kg+gold+in+rupees
    • 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_off0000fbda.bin
79bf3b44427d0e4fa3194929e6adb9f39b7c18b1511577861c09ca0804449ed0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 16948 bytes
font_01_sfnt_off00012818.bin
b889d79ef0bd6f2b52350b2a3905997cd055039fa12c897d41731c222fd4d69c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12818 10788 bytes
font_02_sfnt_off000140e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140E5 16792 bytes