Malicious PDF — malware analysis report

Static analysis result for SHA-256 359036654d943ea3…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 02:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4345bad87f142a17a874617939e0a64d SHA-1: 428768af0d13fa6624a1cb2d62e2c09fd49f823e SHA-256: 359036654d943ea388049b0c12f9f6f7bbafe7615986a3f81053dddcbdfbf4f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=how+to+reset+dns+settings+android
    • http://ankaraeksioglu.com/resimler/files/wulilanulopusifoxux.pdf
    • http://auto-rad.pl/userfiles/file/foperalafogamolegugodem.pdf
    • http://pappteam.hu/userfiles/file/68440658555.pdf
    • https://apc-algercentre.dz/ckfinder/userfiles/files/nixenonezami.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/gbohs5p714eqakoj44b0loe0dm/30366715216.pdf
    • https://1000families.eu/userfiles/file/vakurexozujopukakisonod.pdf
    • http://shipagents.nl/uploadfiles/file/22934189541.pdf
    • http://ggmtc.net/userfiles/files/87798491207.pdf
    • http://vip-cond.ru/userfiles/file/tatomurabe.pdf
    • https://buddhaart.in/userfiles/file/34100540101.pdf
    • https://amgaa.org/temp/files/21849114947.pdf
    • http://mbjarrahi.com/UploadedFiles/New/file/kujan.pdf
    • https://ku4ysk-9lgp4y.com/contents/files/83676680352.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615106d34f34a---xajovawutitujixotig.pdf
    • http://volkshilfe-ktn.at/images/content/files/66187192589.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfa3657336---72660078277.pdf
    • http://lt101shop.com/userfiles/files/kerumagekutukadu.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/621714c99adf9c914e3fad5da89a0e5e/tiwuriporagasogejakejanaf.pdf
    • http://landia-print.com/pdir/file/9393787323.pdf
    • http://anoh.net/pds/userfiles/files/vosokisuwipu.pdf
    • https://hkbca.org/UploadFiles/file/20210905205710131.pdf
    • http://talk200.com/admin/admin/uploadfiles/file/72321057636.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://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_off0000b152.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB152 16792 bytes
font_01_sfnt_off0000c969.bin
4ce917666506a976bb87752b76bb9f61e53070e2236207740e6d467aaca1ec6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC969 10456 bytes
font_02_sfnt_off0000e116.bin
41bae5f577c19f77b6c038122dda95a413634e6ae49fc0d06c4404e0339f5476		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 16972 bytes

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