Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b1d7f4398139ec…

MALICIOUS

PDF

85.9 KB Created: 2021-06-30 00:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2be5163e59274f7a489442135d2f9129 SHA-1: 1fec751c4f44a263dcb7f169022e02082bf03481 SHA-256: d7b1d7f4398139ece2db522b0f5dbea15801a5f301cbec8dea1dea7355ba666c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=gta+san+andreas+free+download+for+pc+windows+10+full+version
    • http://wardwrightself.com/clients/863644/File/sofomipakisu.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160acb89bde4a7---886676189.pdf
    • http://infunplastic.com/d/files/vureropenateron.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7d35c9591---tedupo.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/86f6d533fcdbf6eb2aafe4f082072aa8/murosuzidavikus.pdf
    • http://centrons.com/uploaded/file/168721761360cfba279401b.pdf
    • http://renovator.cz/files/file/wenovux.pdf
    • https://a2designbg.com/userfiles/file/38355427365.pdf
    • http://sangiorgioautoservizi.com/userfiles/files/84095664602.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaffd7f57e---mapabiveloniw.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98dbc56b1f---kenikatazatudaferelaga.pdf
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/zefililopaza.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/7q8bpbgmbnmmth4maoetasmb76/2824082431.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/67cd06f06cbc7817739772b4ad03e2d4/nabobetinebigap.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/hfqplc0i4avvok3q9scnq7gss5/92525800161.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaef43b51d---21773963929.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/f4a81ffc37c06a697711bdbb1bcb6a97/dutaviza.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc4a445cc---zodasoxikatisutovugifu.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/a3th2s11oa27bjqni7uu0ce5ne/lapososonolafumudalezej.pdf
    • http://archerelectricsupply.com/userfiles/file/15708054007.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/88d955b3006189d470fd1e3884a724ab/85139579808.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abf4da00c1a---87264214899.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/311a1d42226ca233ece47436651fd2cf/28445769705.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/b8eij33idf7qpk7h0ppg792d9o/jedat.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_off0000ea23.bin
11c645e143661a465914b9ac147569ea1aa4cf7e0d44bbd4401ee40936355f20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 17348 bytes
font_01_sfnt_off0001175d.bin
1c1f9949b335e4aaeb72c285c8871060d4b280a11abc5ffae5902fb719e29109		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1175D 11076 bytes
font_02_sfnt_off0001316b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1316B 16792 bytes

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