Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3b53ccba4c7b00…

MALICIOUS

PDF

86.8 KB Created: 2021-07-03 16:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4321dc7b8cdcee6d5610ff5869447322 SHA-1: c65b5951617bdcccd3f2a9549bf1313d0d6923ae SHA-256: 5f3b53ccba4c7b00a64ad6b6997e7cedb51e723ffe96c906a833ef155f84b4de
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, a common tactic for distributing malicious content or conducting phishing. ClamAV and ML classifiers strongly indicate maliciousness, and the structure suggests a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://vekosgroup.ru/userfiles/file/71586212799.pdf In PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/h9d0l6q0uep37q0j0fef5so1fg/xobapofaxovagogilit.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096c60145f11---gowepapibotomekujax.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/k1vo4b18tachrj44e4n2bn4rrg/wofuviseteroj.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607889b563a1b---ginoteposoxutud.pdfIn PDF document text
    • https://egf.tw/test2/images/file/sodidakitisejovoxuxomilaj.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ab750debf---13749158272.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/63602209141.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/lamagizama.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/dca98d2c158119707ec0ff5e4a60464c/74552214851.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/1h9urv4q8uj9ls3l0qa8d9ffmp/94749151201.pdfIn PDF document text
    • http://nietegeleuve.nl/cms/files/79800906186.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b284abb7ab4---lalukododedove.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830ce69fb0e---98987087891.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/65856068676.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ar6icm445h4bar5rfnoas7dme0/47636135550.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf5986a331---muxoseweval.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/47695640260cab939083e2.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6059be9ca---68210189696.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/auqpupgat9jh9jhunqpms5t57o/77113028333.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/bc9f955fb6bb5382ba13f7be125ef046/6708440638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=aerobic+exercise+boost+metabolismPDF 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_off0000f0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10903 17236 bytes
SHA-256: a91edf58479e558bd11b88c9b8741cf17dcf7551597ade21fe83e86403340bfb
font_02_sfnt_off00013628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13628 10508 bytes
SHA-256: 87ba4456c3e961c34ea1c415a7e32e4b2309003030c78aabb2f6ba07007b79fb

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