Malicious PDF — malware analysis report

Static analysis result for SHA-256 940bcdbff6cbcd9d…

MALICIOUS

PDF

91.3 KB Created: 2021-07-01 15:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0f52b0bba99387e7880b54ed63d49e88 SHA-1: 77b65aa312c64f1b671987b343fde6b9784ce958 SHA-256: 940bcdbff6cbcd9d2706b141134d2163426b3bfe70f8f851fe0696d4df53f014
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs and link farms hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. Although no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=dell+chromebook+11+3120+android+apps PDF link annotation
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac28b6d26ea---77303127837.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a005ed312d8---bizazu.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/tusopefotedimazar.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcbcf23fc6---76963314165.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/maxubapesurarax.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/88216745970.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/c8f3963550056e724b30b9ef3cdfc267/98030526358.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/defopubove.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8c217648d1e621c9d5d1709ac856157/33089814094.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160971c8496853---zamaxu.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078bea568505---27736655000.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ukt21cu00r7qavdtlt8msrt3hn/70097911081.pdfIn PDF document text
    • http://cjatkinson.com/userimages/fowuvijixepigova.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/35f67c74f758e07276843fedbceb7c23/73232821104.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160910535a7fda---25187283629.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/ropitisifegiruzil.pdfIn PDF document text
    • https://anfauglir.com/images/file/dizukisugitivadoriwilene.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///89926993669.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31979b32d0---dojediburular.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/381a6fbe399e27e74b511471c69dc79c/gunexirebowenenu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a37b9268ae8---43631446935.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/lazagomabuvaxog.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/puwaxupurilenenikorijije.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001179a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 11380 bytes
SHA-256: 20634374f7a8a95b1a54784e90a2babe642b04aaae6a60ed8986a0233ea7ee97
font_02_sfnt_off00013209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13209 17276 bytes
SHA-256: 167f004a5af04bb75eb2cdff175ef8e1ba5e9d9fe399943e8ceacda91cfababc

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