Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a071a9c78bea039…

MALICIOUS

PDF

82.2 KB Created: 2021-08-07 13:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d65554a672e9b564391cb03e1a94da47 SHA-1: 4a10975c45d82acffe1ab05dc007c853649ee552 SHA-256: 2a071a9c78bea039723e322f8d0f1bba29a09cc3e1060cf86720106d992be5a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files, many hosted on domains associated with compromised CMS uploads or identified as disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure suggests a link farm designed to lure users to malicious content, potentially leveraging SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://binhvi.com/upload/files/lebibexane.pdf
    • http://magooferta.pl/uploads/fck/file/vajazudorifumavabuliba.pdf
    • http://sun-green.de/ckfinder/userfiles/files/86221304286.pdf
    • https://glycocalyx.nl/userfiles/image/file/mefuxaninitawasik.pdf
    • http://kezmosas.hu/files/file/27783647600.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed740ec9828---wulajexanematodolerafop.pdf
    • http://xn--9w3b11kh5l.com/ckupload/files/najilikeg.pdf
    • https://ost-fogging.com/upload/files/14568681770.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3112242505---99354066392.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/11995602263.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607df77e8e406---dimopeturisuta.pdf
    • http://china-baby-clothes.com/d/files/komonuvofinimimiwegewibu.pdf
    • http://opusbiz.kr/data/editor/file/182160254960f516633f36e.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/81bf325744167df2e9e643a81e7cf4b1/ketowovilosa.pdf
    • https://gadd-asso.org/userfiles/file/18508312107.pdf
    • http://itkaufmann.com/images/fckimages/file/nudide.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160956202a5cc9---geletafewejavuxi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cuanto+son+3+pies+y+4+pulgadas+en+centimetros
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da01.bin
3e0c1bd2d3d2b0679f3c9c51cbe8c94d8090bc370165412be0783ec9d0017b8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 17524 bytes
font_01_sfnt_off000106ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 16792 bytes
font_02_sfnt_off00011f05.bin
59d156cff8e327d0bc85a8daa1c71af8f99c85a973a7a9adf99bc4e883db3126		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F05 11352 bytes

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