Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85d2485cae96c83…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 19:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e2ff9d4eccdc63319f4d00b87963d816 SHA-1: 4ad9bd6a9d32acd8601f51e75cffbd0320ffd6f0 SHA-256: c85d2485cae96c8365f22fa9b02dfe86488545fd1d3f198601e64b5a5f5fac03
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18487243044.pdf In PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ofbd6geu0ni3hb99d8ub1sc081/wegugosixitajukamoz.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/24076548648.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/78876015529.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ebd207706d2d7ba7892098dd0fe4874f/vatatovavurikutojud.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedac492256---rudotuba.pdfIn PDF document text
    • https://hsse.cl/files/51633050767.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/pubanimamuvenupev.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/3049001815.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0e6eb6071---vomolonefifamopepapowod.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4080f0675dbabff0d1a0f185d65c80a2/jokasufixuxoxo.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/6e720a09873b0105a55345cd663165c9/85850882126.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/3750096cb680a2376b9a37d8300dc401/zijepot.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/zazosijefiboro.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/madilogi.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/xemaxopa.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/79262354774.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/98052684232.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/8270776584.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/296bd18395b3ce10ef8476b7767e66fd/nirijavepozoruba.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/goatkr4ghircnluem59r3ih4b6/ruxukop.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/58966470252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=insert+link+into+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_off0000cfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 10372 bytes
SHA-256: 158a28b127dd99d7273fb7a61cdc19c2906ecb1c34be2eeb14887fff40548af6
font_02_sfnt_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 17044 bytes
SHA-256: afe743d0abb89896d39838dfe169b92a0411b242090f2aab39c398bd2d727c81

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