Malicious PDF — malware analysis report

Static analysis result for SHA-256 595bb7560a4a2d7c…

MALICIOUS

PDF

84.1 KB Created: 2021-09-12 12:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 178d6bc857e3d19ff391aae726a88262 SHA-1: 0c2f9d7ba0ca4a358db1d43426a9a7e8e2668f15 SHA-256: 595bb7560a4a2d7cabe9df333361550702b5fe74fac94a4faf6c9c787bba7889
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The primary attack pattern involves luring users through these links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tgvl.in/uploads/fck/files/famupupewijitutopabi.pdf In PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/zifisememumup.pdfIn PDF document text
    • https://mklaassen.nl/images/file/43793781375.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/81988682331.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/faloxabirilad.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355d9304c5e---kuraxebu.pdfIn PDF document text
    • https://akconta.com/uploads/files/lajobobo.pdfIn PDF document text
    • http://nikacarpet.nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/22969767009.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e11135d4a---83675532864.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/50728549916.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/xadenuxezuwobupazukafib.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/32267865676.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/9e28456034c904b1439b96e43dd1a6d0/xikebowevojinibijosinex.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380e46a63dd---76293975390.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/77979403463.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161353bdc519f2---20923640882.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/wepibasofirexovijuwala.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/8315281440.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef744053ac---musopetejapatuxu.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3b1698f504a6d932bd740d2d7047763b/bepomoxaro.pdfIn PDF document text
    • http://suaups.net/userfiles/file/59915819096.pdfIn PDF document text
    • http://enricobarraco.com/files/pidifimilavuba.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/10753005472.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/wufuxozepepafenarifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mobile+legends+naruto+skin+mod+apkPDF 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_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 11060 bytes
SHA-256: 260a65c7aeaf77d41c36ad58f2be202e9ba5660966ca3e5040660464b5c86d3b
font_01_sfnt_off0000fcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 17476 bytes
SHA-256: d38ff20c2db5d6225274e6bcc554d6fed6ed9f4d3bbe23dbb795a39d57d38e83
font_02_sfnt_off00012a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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