Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24f04e891048547…

MALICIOUS

PDF

92.7 KB Created: 2021-09-04 22:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 39f245c1e83519e393718df455a7375f SHA-1: 7906199de2fec4250ace783a47326a0907cc7c86 SHA-256: d24f04e89104854730339209a5356fd016a96cba6949e163933a6187a20663c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate this is likely a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, aligning with a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.pattyn360.com/upload/forum/files/xisij.pdf In PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d826614d841---9341085072.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad951fd3b3d---94842895267.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/22443026112.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/353i1ditgkmm50kd0hv40s868h/13901031731.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a12ac1d21e1a7cff400708d929d8404a/wojofejuj.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/wojubijowubexi.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084248f734ce---46173222274.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/senap.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/navimanusaboribumajiz.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/13677902bb68814f40010384daa2c84e/31849323717.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be8c1c3d408---fezuk.pdfIn PDF document text
    • https://etadelloro.it/images/file/waxesumenewijinixozi.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca915e1ce0---32528654456.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/nobilavapugijaxoj.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/67875851270.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/4521d5e0a4a6dbf5353e63821d78508b/77969416236.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ts2aiblv8t4doj3bsioloho9v1/79322117090.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/80259275015.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/65683402737.pdfIn PDF document text
    • https://numberonerevolution.it/file/tefanudejigojo.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/14883272255.pdfIn PDF document text
    • http://seritour.com/rsm/files/47376870185.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/tafizowugekumo.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/242104367689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=phyllanthus+acidus+pdfPDF 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_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 21596 bytes
SHA-256: 39271927a6061bf0789766af57d97b5ae5213d76104b3c8dabdc327c86ff2a3e
font_02_sfnt_off00014d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8E 10580 bytes
SHA-256: ac412279ca1c26e65dad1d7f88591139f1a56c1a12cc88132d700e99fd55cd4c

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