Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c08e5207bbfdd3…

MALICIOUS

PDF

89.4 KB Created: 2021-07-02 02:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08a8642fe532b28dfb8d4c1be9060164 SHA-1: a332f4d77a728b48724a496377f488bd44fa2b0c SHA-256: a2c08e5207bbfdd32ce7a3b7ae6f56fdd24e3ce8461521441835771cf74f4368
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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 https://synerhu.ru/uplcv?utm_term=cod+warzone+how+to+unblock+player
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/2ff32ca166d8cd46087de888c3491428/81250692521.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f26d33c61---xawilebi.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/f262ab62b3af50bbd451943bb5d3c1d2/kodibafemozepazinuvibu.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/86fe1adefb1128e94db906ccbc46571c/9001117960.pdf
    • http://barudan.hk/UploadFile/file/20210620172833408.pdf
    • http://asja-doll.ru/userfiles/file/54004262155.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/o6a9ljrfnr6f3690r7j6g99p57/39487722886.pdf
    • https://grup-insaat.com/userfiles/file/fujapepemok.pdf
    • http://snsi.jp/image/news_file/zawalego.pdf
    • http://texmet.pl/userimages/file/xasegamavovafim.pdf
    • https://alusol-kw.com/ckfinder/userfiles/files/70489926302.pdf
    • http://fiumaradelsossio.it/userfiles/files/23515044013.pdf
    • https://protectname.xyz/whoisprivacy/userfiles/files/zuzeronosowujex.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7734dd6fc---xivubuladaju.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160daaf0703986---66260751862.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/s8v1p452lfabqg03h3nbml4hn5/18225567242.pdf
    • http://blatt-gruen.ch/files/rideme.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/2d1d9eaa6654e64d0d3327faea01cc36/sanasurujesujized.pdf
    • https://travelsafeway.com/userfiles/file/rofiwabuwemotiwuwuku.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/96553b9617f5c549aae34d005df2b7a0/94362923961.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717a773c48a---runodomokifo.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c74363a8d31---denalisaveb.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a43567cfcc5---48438993898.pdf
    • http://chandigarhdatarecovery.com/files/file/63271220763.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4b9951420---wiwajiwofaxirulepejivafap.pdf
    • http://robalton.es/Albums/images/file///zonudomexorenelulotomapi.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/12357e2c559ad558200fc919e23418c1/7221291790.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000125af.bin
07ad51646635f5badfb407700217097d3ced16e119c2d43554bb4fae1acec0a4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x125AF 17264 bytes
font_00_sfnt_off0000dc94.bin
d6100631abc40fda696c129b7177380d786b57f0c7b6de8b62001328aec460bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 18080 bytes
font_01_sfnt_off00010c67.bin
a11564456a9095ec5e37561da61bd743b59e4a6b85e23ac8d410d49d594cc1bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 10976 bytes
font_03_sfnt_off00013f53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F53 16792 bytes

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