Malicious PDF — malware analysis report

Static analysis result for SHA-256 f96f9edb7a147719…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 07:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e3c77fbe8eff0c9de65272be33543cac SHA-1: 911d6c10abfdf3827597e26e5e3b2b12d52e6985 SHA-256: f96f9edb7a14771962d705694be5c0f9239400444f1305a2370795c0bd62dde8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites hosting other PDF files, indicating a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/pdqtmprg7npgvi1cea1vn895eg/vapupakeri.pdf In PDF document text
    • http://abc-tel.ru/data/File/kosinuve.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/midirezipujebesiruxagexi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/189d1fa928476f47b3a8e350c860aafd/14506064575.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/5cir700317h8f729ubbj64g3h6/ketidaporabapogesog.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bba247ed0---sibutumepa.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/vgv70s32lfjp20puam1jdnmoq6/46628632675.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/rabivawosoxusexo.pdfIn PDF document text
    • http://sciattella.net/images/file/23095581703.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/sulofuluzipe.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/40b1960322d17897b2d2590046c33585/bigefigizolorerira.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c195e99613d407d16a8ed88f3c3476fc/famonivurigizawi.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bf3c2195d---siralozigu.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/51357884822.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/zisababiz.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/19375780527.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/83889438188.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/bakigowuvukejijul.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c415a05ad2---lavexofapani.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/32561270660.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087f77f69fa5---33115213078.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76c64438cf5725f81c7d159bf37f0112/jikijatolazi.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/34537613175.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77dd569a4---tisovegaxobutinuwuniful.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/kuxozigobojelamunoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ridgid+shop+vac+manual+9+gallonPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB28 17752 bytes
SHA-256: 506c47283e9cccf54b69e1fc0c45ed14dfae6bd5506efcca0d3d637ff4d71de3
font_01_sfnt_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 11012 bytes
SHA-256: 5acc71b65010ce83f6d09a46de26049179b4bcf5852e2bda99469b58c45f500a
font_02_sfnt_off0001129f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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