Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a641ec3af698db…

MALICIOUS

PDF

78.6 KB Created: 2021-06-23 23:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e39bcfbea7b957537d83018ba3127331 SHA-1: 3cccee215383331a61e272ee1291dc9c179a847a SHA-256: c2a641ec3af698db79e7344ed1f6ef6bff20f7366c7127defcbcc447c7916c9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to exploit users by directing them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c519d31572f---39952280237.pdf
    • http://caopump.com/admin/userfiles/file/70809395582.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1741d65817---bolonasorurepovuruwoxoti.pdf
    • https://beldaoyun.com/calisma2/files/uploads/tojet.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/fo1lgq843e53hlrk54udqla0q4/vilurit.pdf
    • http://gfb.it/upload/fck/file/23805120412.pdf
    • http://nacyc.jp/Upload/file/gewolixatetega.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db1629b0ab---kokipilizegoviw.pdf
    • http://hungbuloon.com/media/ftp/file/12027515975.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b834454fef5---temenigipuxosadarinani.pdf
    • http://studioingegneramato.com/userfiles/files/81677643559.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/83221c50dbe7cced9947851de4b58088/95816430389.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/c8c464df6d4543b21fd9a7044090e69a/60170921350.pdf
    • http://aivieksteslaivas.lv/userfiles/file/48338253956.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/78219812598.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/95880876313.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8adbccadc---83154164455.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738429f1164---janux.pdf
    • http://studioarchperissinotto.eu/userfiles/files/30614614559.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=discrete+mathematics+sandy+irani+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f564.bin
fda15c0a0847b5d3a7b7acc9e986d85f8e05d9cec6ae64ebe7765352626b7601		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 5464 bytes
font_01_sfnt_off000107d8.bin
ee080e2ffcc0e72ea99ff5f1ffe4ee0620b793fedce05fcb0852ec16a4cab68c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 10876 bytes

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