Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c101352dab7acbc…

MALICIOUS

PDF

123.6 KB Created: 2021-08-06 17:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 76c2364b8dba9565a9e36efacf50e89f SHA-1: e84753038e2e209de5fdebeda94de84c1e5a53e7 SHA-256: 5c101352dab7acbc6f46859581e21cd184f09ba96604dcff0952253197470d4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised WordPress uploads and disposable hosting, likely intended to redirect users to malicious content. No scripts were extracted, but the structure suggests a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9808

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://mttrasportisrl.it/dati/upload/file/latapokeluri.pdf In PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/20aeb92fddf93d94ea017a34806f7bda/butavebezagulu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7881f25f3---39742323101.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/lidurasidusaxepulofilozut.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/kugif.pdfIn PDF document text
    • http://abnicum.com/files/file/28029795629.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-07/images/files/zusede.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210611_B3175F5A8146C29C.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e4816064d---48468616986.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/1a0618cb7608ef2ca156fb1c3418f47a/65278166681.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/rufat.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/dalisitatidixix.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ce3fffa1e94eb4ec6c60358ad0162e14/41876934613.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c98530b54f---66378644817.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/j47lq4f0s2ns2c21b30i4e2kqu/4538607361.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/56055651491.pdfIn PDF document text
    • https://5udua.com/contents//files/16553090886.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/292496e78e9c36c69f43f83c6b099344/fizajedemomarilera.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/sudigurudabujotapugefe.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/25552250689.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/82248758577.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/hjg0j9cg6441fevugb0a0i6rdq/kusijatuvukepenuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=s%26w+686+review+hickok45PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F76 22600 bytes
SHA-256: 9d0cb7c3d483ebd5c7b5592337a79c32944a1358bf591ad3c0e69213a6d49275
font_02_sfnt_off0001689d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1689D 34928 bytes
SHA-256: 29c34ab86c1ef84cdd06d18ae000a3de7e6850ea05f6ca8f82ff0d13d859c513
font_03_sfnt_off0001cb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB46 9148 bytes
SHA-256: 068d7593d680cf987ffe66044c416b5b513915a5de28901e3c13f1d1b86c4a20

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