Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cbe102605fe402…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 11:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 91e0a7d82335c1cccfa062ee9590b6be SHA-1: 7fbc3a5d8a0af7e225fb15dc3d3d7feda30940e2 SHA-256: 36cbe102605fe402c97f1883d6953f260c6bdb663d04e3ee8c0febf6a7dbcd4b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and embedded URLs point towards a phishing lure designed to redirect users to external sites.

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 http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612856ae05fc5---viselatopox.pdf In PDF document text
    • https://topclassgreenery.nl/images/file/xogorisif.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ba2ac685c207588a8e0dfb51025c39aa/jidez.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/dugugimipivalexepop.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/98953261197.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/mokesifofijakefolalib.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/87443734689.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/tobemulusogarobumenixewos.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608418d90e872---68440182519.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160805a7b5838b---dumunurojir.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/tofomijoj.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607228b0b8b7a---72099832470.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7c804c627fb4cf0d11b34078986e46e7/nisovalofalilowope.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/59330016229.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/81302426912.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/9627361623.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/tosexuwaxinanavukugozil.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/l037do5il5ovajkt6d4uursaq6/zekarewep.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a17d126a134---ninibekumumetenarewuwa.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/sogevezasivebebasafi.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/tupab.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/50376536425.pdfIn PDF document text
    • https://jetaime-shop.com/files/70564154557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+craft+smooth+stone+slabPDF 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_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 10724 bytes
SHA-256: 8fdb5c2cea6eecc88658b6abdc0c9dcb28b41ad9a98e3f3303f2a5703a741d2d
font_01_sfnt_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001079b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079B 18432 bytes
SHA-256: 11b322f74d7cb11a4427db162ab2da8452ce7791f6e54c31f9e716a620bf7dec

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