Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbb4057b33cc15b…

MALICIOUS

PDF

87.6 KB Created: 2021-06-30 05:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9f58321859a91aa36e29673248bb22e SHA-1: 7165c30a748c915d81fd62ed4442fbf6c9694fa0 SHA-256: fbbb4057b33cc15bbc00cf14a178fc5b8380847407620473ee4e6284ae814ca4
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are likely intended to lure users into downloading further malicious content or visiting phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/3a8712aa0ef7a165460dc5694a17407e/80890115064.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf987e8adc1---pijejalafijasugi.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c161dbba22e---jewiwufeb.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/34108712686.pdf
    • http://imailbox.nl/images/uploadedimages/file/janapi.pdf
    • http://happy-travel089.com/CKEdit/upload/files/50452367402.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608151c64b3c0---76849434278.pdf
    • http://accu-chek-event.com/ckupload/files/zimapibikeki.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ea77862f9---sinuxeku.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb97368a5c---nigixoponafobavak.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/0qil82fc6t9ckjoidr4muune10/98553649634.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/fc647551f77f062fcfb00bb3684aa8c4/49283459190.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//nezuzekupobilewatekolanex.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16071a705cbf1a---muwimukivebemifopo.pdf
    • https://chpcentre.com/files/file/71529339973.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/tlesuif4aj2gli3ks5qan8gm9p/godev.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16071854a3b7f5---jomozosa.pdf
    • http://soles2walk.cz/data/file/14893447747.pdf
    • http://bebelino.ru/userfiles/file/pifezetominajatekuwula.pdf
    • http://drukarnia-warszawa.pl/pliki/file/67050705871.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/a169ea7671da83facaca544e1e916c70/zasutisagi.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b67db8c5629---durejoviwusireragoruvo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=free+download+pdf+android
    • 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_off0000f6f6.bin
ff1a88b5c497034809aa5cdd04b2db7a310231ed6404b870f41986eb162f4016
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F6 16580 bytes
font_01_sfnt_off000121ef.bin
8b0e56ce54e2cd07dc2f99a0e8f0847f5aba58f255dcf18e1860d31eea95e690
pdf-font-stream PDF embedded font (sfnt) at offset 0x121EF 10288 bytes
font_02_sfnt_off0001392d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1392D 16792 bytes