Malicious PDF — malware analysis report

Static analysis result for SHA-256 193d99221687ce0b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 08:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ea2ab4051737f6111a38e13946bf7c76 SHA-1: 89c63ea8c8a0f11e105bde334de22b312eb96a17 SHA-256: 193d99221687ce0b9aa011633360c51f7806700991d74b5255230ea8200538b8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fminterativa.net/cms/plugins/ckfinder/userfiles/files/kowesopitoxovudoreru.pdf In PDF document text
    • http://debseven.net/UserFiles/File/96236027085.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/82040494682.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/bukolimonimedoze.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139671543425---waliretafezodukujevidu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613640e7e0555---jupunifujuxegef.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/87898483706.pdfIn PDF document text
    • http://18554080.com/userfiles/file/biwozodiz.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/jikaladulajuzoralop.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9f382f879---55375337854.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109081552379088.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/94111251641.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/rukabot.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/zuxoboruvezo.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/34806551038.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/85565814092.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/vadujataguwagas.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/18976415369.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16135977d02531---64353777555.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/65999451588.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/32259323993.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376a170cdbd---96642529746.pdfIn PDF document text
    • https://mimpishio.com/contents/files/sulufazesomofanizulifovos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=where+can+i+watch+blazing+saddlesPDF 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_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 17532 bytes
SHA-256: cc975293c2e976378baad959fdd2652b35f707a81e31b1fb1baadacdebc3e062
font_01_sfnt_off00010e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E60 10808 bytes
SHA-256: 7cad70e79cc9c3e176ca9128d747b67103ca672e036a5a294ecbfcdd279831f1
font_02_sfnt_off00012721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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