Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd5f2083d6fb0a9…

MALICIOUS

PDF

72.1 KB Created: 2021-09-07 03:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9df5abbaaa1baac193c74d8117262c76 SHA-1: b8c5bcb5d253102e498665233c0fa7a3441c52f2 SHA-256: ccd5f2083d6fb0a9f8ead007a4c0c7c746b71577f030a11d9de0edc9d2d441f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or SEO spam campaign. The PDF document itself contains garbled text, indicating it is not intended for human consumption but rather as a vehicle for these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://coretry.ru/uplcv?utm_term=numerical+optimization+nocedal+wright+pdf PDF link annotation
    • https://menu2uplus.com/images/file/91875966686.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166ab853e4---87856991138.pdfIn PDF document text
    • https://soechi.id/userfiles/file/29485226172.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/13f157efc50c04edc5c536d69c234070/nixeponowibirafufimat.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/bemefatepelote.pdfIn PDF document text
    • http://kgmda.com/upload/files/18868884330.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/jogagewu.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/55023921984.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/tulimojojogopuxewev.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c85058c8a---86842882107.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bc8fe8609---rifibotijolu.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202161964107779.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/9486aa2c1de043a5bed5e113577c43c7/41413136674.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/928d62830250fda35eb1ea2411a799d5/sobogarawuzejevusibop.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/m5hn3oimdhl7lsdesh0jl0pbha/89631794221.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091c05399823---41267545927.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeda6809c1---vavekepajutufupelaza.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/71937956332.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/13729652582.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/56819103320.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b527896d3b---9624774760.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad675fb996a---bepakupilofokezuza.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/7698480108.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9d74370ad5b31e91bc376a96ac7e405f/mobunigujovonuzavuloj.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_off0000ba44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA44 15444 bytes
SHA-256: 52c95a4bc39a5af61aeb788134d6ce729c48a7d2b273b5f2f0f487f22cae64b4
font_01_sfnt_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 11120 bytes
SHA-256: 29a88ed5deb9df03eb15cb3c78d2691c7e40b77384a81f65dc5289939990759e

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