Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c59bf3dcd56b9e…

MALICIOUS

PDF

73.0 KB Created: 2021-09-28 04:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32f3428aa71b54b57dac7e5557e8f120 SHA-1: 4f9484282bead9a5e4ea7b5da609c1ca8da7332f SHA-256: 51c59bf3dcd56b9efa47f9a34e9c20ef06982a3ec5bad5fb9437dbd96ddf6656
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mixline.ru/img/lib/file/73023491089.pdf In PDF document text
    • https://camgloberealtor.com/userfiles/file/tovufududajoxumozofufola.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613223c39c6cb---19450871984.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/83575885829.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/wuxodilerilawuxil.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/sexumudatoxorul.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/72916167786.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416a97524a4---96189941913.pdfIn PDF document text
    • http://contua.org/userfiles/file/89106897290.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/73460951226.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/4290473256.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/35181179599.pdfIn PDF document text
    • https://oasis-travel.ro/files/bijosifim.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/mopigebumexabotejodoribop.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/maxegututikivaxi.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/17868930338.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/21419501964.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/panodudebizopukiwoziwapo.pdfIn PDF document text
    • http://leton.pl/userfiles/file/95273373901.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140481e0b3c6---69926898898.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1ebf99738---wopabugetuluruzegadunuz.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/fefinisanotido.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///49976219438.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/48260865846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+long+can+you+leave+uncooked+chicken+in+the+refrigeratorPDF 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_off0000b87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87E 17036 bytes
SHA-256: 3ff0632f78742d29e4be4ef84508ef3c2c938c9eb52d2a9afbc7ee265be96de1
font_01_sfnt_off0000e3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FF 11036 bytes
SHA-256: fa5855eda691025294376072d799d6ad62e20f3fbf36536beb7eea7b72d12df4
font_02_sfnt_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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