Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54d1f3bf19ee6ac…

MALICIOUS

PDF

117.7 KB Created: 2021-08-01 00:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bc40ca6600f4babadac5797ac868cec7 SHA-1: fea001bb7142f154238dacbabfca130f081ed803 SHA-256: f54d1f3bf19ee6acc20a6e3c214f25102e9c7f4c6db32a8889ab4fb5251a3f44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs hosted on various domains, many of which are associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://thevelascofamily.com/clients/11614/File/32671522316.pdf In PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/db4838985bf7daf06c47ae8c3da184a0/16051128076.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1bd3789cfa---64184153429.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/54895812597.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/bf5b6cbd884753bebe2eea66b9782457/pebowobovajadosimij.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/48894804675.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc58d152e1---vetumizawenarobame.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/timejajokalanatovulamen.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4677b18b9---58427596208.pdfIn PDF document text
    • http://sun-tes.ru/files/file/40806392837.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64723db3e6---42380223654.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/petulimowerivixum.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/79995438352.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609e036c15af5---62843716946.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160780f4e6a2bb---pidetunalukunebisape.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab7ff1096c---davoroso.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d53366c1ba7777dc7cb7b3e28047fe7f/23892383115.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/semamebu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa159d19a3f---kepedikimumemubenuvifujiv.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/58heacfms4kae220guk5ggeipf/gopebokosaxiz.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-1/20210701040629561242.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/77791409868.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef72287946---9381909537.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/93d68b5c4ee5246fa49f5bb66fa5eae6/83569154758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=troy+bilt+tb200+repair+manualPDF 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_off000139b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B4 17100 bytes
SHA-256: 44b190269a2be87ab80e6b7f46e01d2fa61cae7d2c394ada315f2f7aa706d6b6
font_01_sfnt_off000166a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166A1 10804 bytes
SHA-256: 0f5af8e794e339a35a8a17ff48807f8269412e1c2a0e5b85545c747b756d5f99
font_02_sfnt_off00017f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F4B 14456 bytes
SHA-256: e7e56992adb7f3b3d7065ce3a25dd88fcf8eb5a459218615b929288f1c66e1d7
font_03_sfnt_off0001ac77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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