Malicious PDF — malware analysis report

Static analysis result for SHA-256 df92321baf061a02…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 20:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 91e994f342fd4adbfae43a609f042af5 SHA-1: 66c7e3e8cf0a5de7e23cc52400f0c60bf56dbb46 SHA-256: df92321baf061a02bd19466f6c7dbf2050ca80890fe34245c59a8b96c09d50cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=best+torrent+sites+for+music PDF link annotation
    • http://msslink.ru/userfiles/files/32364210489.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/kufafimo.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1632353238_f020c43ed3.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/satomajo.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613562e39a97e---37998749355.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/dubuzufokesive.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/lufirazefikazitozozaseg.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0905/f2401c43beb0978a5824bb4ba974bf86.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16149276f90857---50297854001.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/98337482173.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/pukurodixepenatod.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021921238302237.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/322tpceono3mq4bh1d41brr7e5/xitora.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/7274895065.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/wiwej.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23177085975.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/78152239891.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/fc488d6c42e76f42362c5df8b8c1d59f/79163121686.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/8430006274.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/98983660944.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140826cda6ea---naxilapeduxasanilu.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/492666269.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/89372137053.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f157bf2fe---66519980156.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1D 10444 bytes
SHA-256: 58c08450c43daaf6ec3145fc946d926ce61b54ffb56436d1e0b6cc1a07d3b371
font_02_sfnt_off0000e4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 14920 bytes
SHA-256: 45115b6abc68f9cb15eb6d744f3a06479d2ee6b2ce790c0b38b9f8f0b45e3fb8

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