Malicious PDF — malware analysis report

Static analysis result for SHA-256 4038cfbe9e6793db…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 13:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a842f773b6ade2b93bbdc239345b0db SHA-1: 1e0ae9bd05e1169e7a199a8448d4d2d99ee30d42 SHA-256: 4038cfbe9e6793db6813be554131f74a90dbf22ab7b6e4ccd866ca4db86a882f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious and exhibits characteristics of an advance-fee scam, luring the user with promises of prizes or funds. The presence of embedded JavaScript, although not fully detailed, suggests an attempt to execute malicious code or redirect the user. The document also contains numerous links to compromised WordPress sites and disposable hosting, likely serving as part of a link farm to obscure the true destination or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://singlespeed-switzerland.ch/userfiles/files/63654925180.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ag31idtlch1end7l4obg2u8ng/wikixopit.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608008e1c0e55---tobidomupaborizerur.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/mf2bhhp8mflklqnkbii45vqqb0/murivu.pdf
    • http://kiiga.ru/userfiles/file/gelalirujefis.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161299c210260d---73082015561.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/3b00fb1925f652e3533a455189628759/mepawabuketobam.pdf
    • http://spadhotel.com/basefile/spadhotelcom/files/58776263560.pdf
    • https://chmelo.hu/sites/default/files/file/lorotorimeguzo.pdf
    • https://securitydm.rs/slicice/file/86822344614.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/dioje3jkspb410nb2c9pd85u40/ziduwipowopozefutojaximo.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16076f705ce037---fatobadodelexesozadaluliw.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/31gdicmhokg8j54b1e9hsu0jc9/nofojaxagudoviz.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/49fkaofpfbeaqhdlg7nuqmnthc/zupikalirug.pdf
    • https://ibericadearmerias.com/file/15229544247.pdf
    • http://ohappy.org/userData/board/file/2570874197.pdf
    • http://studiobaldizzone.com/userfiles/files/17092564225.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607236d569c92---54776180975.pdf
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/gufasisapuritaguzowodet.pdf
    • http://cuacuonanbinh.com/userfiles/file/36148045518.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/u3df5uornl9mom66muqobv5rh7/57680346610.pdf
    • http://biemmecommerciale.eu/userfiles/files/vugeworuju.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/tagemubexipojewubo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=9+kwh+per+day
    • 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_off0000ed33.bin
cf7ab8a139af1d4dc01c11f2263a4eb6f95a2cb87aaf889a50a534612b95b266
pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 18060 bytes
font_01_sfnt_off00011bb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 16792 bytes
font_02_sfnt_off000133cb.bin
c8bb0045b53dc46e4cab796807094b3b60fe3c304a85c27063cfe9f70f8d9b5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x133CB 10224 bytes