Malicious PDF — malware analysis report

Static analysis result for SHA-256 7545a63ceba6e944…

MALICIOUS

PDF

108.2 KB Created: 2021-09-03 16:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4d74a5a19dc2618011ef9c329457d81 SHA-1: 440a3250411f11c202f3a9b050f4ae88b900c096 SHA-256: 7545a63ceba6e944f9983b589430e9e53aa757e446f3daf17af36aada08d8fd3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the idea that the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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://drafthe.ru/uplcv?utm_term=manuale+ford+mondeo+2009 PDF link annotation
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073457978389---64329732884.pdfIn PDF document text
    • http://goref.ru/files/file/36465586007.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/09c57a2edcaf5d36a24a2734b729df66/82992913306.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/o7nfcm3agl61n2n2nuvq29q051/79333497350.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4022533a1---xapiremonuke.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16117169e0a5b4---ralurutejiduxufi.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/35727293710.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609134ae25f9d---koduj.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/mumibegesakegiberag.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/khunjvrvlqh3v2ufg1l5chr9d4/56888587211.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/diwulemalugoruli.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6d1243b05---41168163847.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4cb54b829---32776054778.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f656b2405e5c355a45d38bb4b9448b35/difabesaxulazapu.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160765f6ab8b79---34824117123.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612b965e23979---36609092426.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160abda2965585---79973690995.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/fevuf.pdfIn PDF document text
    • https://gilbertems.com/videos/file/62083238310.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/lijiwunulesejumeba.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ddc8110bcdc8b2412e571414c355852b/45501498366.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/rivanapalawugetof.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608033db34859---72614734715.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 16140 bytes
SHA-256: 2e40c969e06661a541bab8cef666ebc654a0d8416a3222ef5092975c876ce786
font_01_sfnt_off00013886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001509d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1509D 10660 bytes
SHA-256: b81484021e4ca8b1e7ba66435adbc295532637003aca40ad0db32b1d17663c76
font_03_sfnt_off0001690a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1690A 22240 bytes
SHA-256: ea3e89d3a29555c0243a46aa14043bca11e6c036958cc9c2e36b16ff6e8eb0ea

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