Malicious PDF — malware analysis report

Static analysis result for SHA-256 d931470f0d392774…

MALICIOUS

PDF

116.7 KB Created: 2021-07-16 14:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e8a24a6165530a4e036055c23f2c8688 SHA-1: dd3c433f63ad9e9de569b4d99d3635359c0fad77 SHA-256: d931470f0d392774261d713caefbc3124b5ec5c010d3c84ec257b630212933ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm on disposable hosting, suggesting a phishing or redirection attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to lure users to malicious content via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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 http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160773185d03e1---gadarubumudedimaju.pdf In PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3cf8584df---71040594165.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/gefh2n9j641dh29170eouifr13/fofubavetodutepatus.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c00491255d0---dasumifibazosif.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/risarosekapaba.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/9f6124ecd38e0d9b2c0cb07fc11251ec/zeruvenek.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798e5c5142e---zuxejezavipofifukepu.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/79114731145.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/1315464589.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a35025675b5c086d5459a72a5a7d5c4a/50361210184.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/96330391547.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49eddc3f38---zelesoze.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/6b6ca65cd265b807e218c49a7a8492dd/1410213817.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/gilumegunujinunoxetoroxo.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160900a73b2184---janowewoguxonejamisitifaw.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/rasaponewokunalijezuno.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e693a02e8e---90058253421.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608143cc4990f---54456332603.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3dd3f2f06---22678162810.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/dorekonaz.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/1d140aaf6adbd5a88eff717abc7fb999/mubukatajoxafagivuru.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803bb0aa54c---56003927940.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/2jqttmr0aj1mv8dq47g3p5ukg6/87247975172.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bd9196aeb---64823327955.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/300b8eedeb6d63367831694f58661a91/wudebejiwujezolabexum.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160826827cf80d---21066771130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=one+piece+episode+207+english+dubPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC0 18276 bytes
SHA-256: cd30083e7c9fabd038b33aeb3881cd73ff07a8735ff020818ade89145b9da773
font_01_sfnt_off00015c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001746e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1746E 10988 bytes
SHA-256: 548ca2ed7089666f688b8e7c5de0cd76e21bf0945ec9507392d694ddd2730682
font_03_sfnt_off00018d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D75 18064 bytes
SHA-256: 7ecfff38d86b4e4025192aff25471d2f974eac44fa7303232656ddf734ddd0d8