Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a649c76277c916…

MALICIOUS

PDF

94.8 KB Created: 2021-06-29 12:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 113f8d45aab7c1ffe13bd8afed358ccf SHA-1: ab35069cfa7b6938873a1d2a87d5e335b87afab1 SHA-256: 09a649c76277c9165705a64476556e8d5c104c71c15da906a9d0a67fcc5f0331
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://winfielddeli.com/ckfinder/userfiles/files/68442935163.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb0a355a62---tupetavokadowo.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606efa71debf2---tatarege.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/fdfcd2f6c7341dcdd82433ea7f9951a6/sukojejiwadifupevosebi.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/87a17d65cf95d262b4d805af34d05919/5242692229.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/fbfc8ffa9a017562a8ae8030646bd241/semajiliwakuwototiwebovaw.pdf
    • http://alpha-cp.com/userfiles/file/19490494396.pdf
    • https://abandassociates.com/ckfinder/userfiles/files/momirinoba.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/kudbo8m2kj3te6gsnm3ev9t4i5/50765249290.pdf
    • http://christschoolblr.in/userfiles/file/37958324423.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/trjphubdr07p0ae4a42im2jjm1/nadomemodubeb.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e749339ef---xixajanudefujufusoke.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073bad991017---nurijit.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/93fb10bde185ca479330a1bef688c8ff/52347009213.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086b8c92d856---jajomeferi.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609c76ec8b316---pojetixurato.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/143a74ce110c60af7dc2287a55affd8c/72424263002.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/74a759054cc39d20ef677cccadddb5c9/83415520342.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b0599799b17---zeloronezova.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b131ebcb692---35515381211.pdf
    • http://elencostruzioni.it/userfiles/files/89163573893.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8158cbb1---82079746142.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hp+unix+interview+questions+answers+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_off00010dd6.bin
7188a1ea83c60b3aaa3f31b59601c4a4dee808de70093a821be86ca75e1e9f16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD6 10936 bytes
font_01_sfnt_off00012725.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12725 16792 bytes
font_02_sfnt_off00013f37.bin
fbb89f52d6edc2c829b8eb6c33ade0404da17b311566d31f4313a03617cfb24b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F37 17792 bytes

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