Malicious PDF — malware analysis report

Static analysis result for SHA-256 85deb1c0279eb759…

MALICIOUS

PDF

98.4 KB Created: 2021-06-28 13:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d81b15c20325d93e6833526cb1775668 SHA-1: 5da0def5072568f7b25bedc98742d15fc95483e0 SHA-256: 85deb1c0279eb759c8741067b9cd85fa4751e4d905d8661e724f2283b90ac00e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://argumentua.com/i/file/porumosenunuve.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ab6d40522e1fc1509737b2de95157fbe/62634918068.pdf
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/48652925211.pdf
    • https://anjingliar2.com/contents//files/92862838394.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/11170275893.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/u5lf2o0qf5degrheoga53rhe15/87387676270.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/tc9no9da2abvl90f7cg80dm3b7/19976893916.pdf
    • http://artecgroupservices.com/imagenes/file/ketate.pdf
    • http://ranaghatpchsschool.org/userfiles/file/lewameranobisolopen.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/b4ab7d76b217dce805e679d398ae11c4/letavafabuzoradenopi.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/bfci2h0ettjb898l2qv60dpgi1/37391516548.pdf
    • http://lawrence-spruill.com/clients/42275/File/gulepunelenas.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbed20f4fe---kepotepe.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/24513757485.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfff39e2ae---limemexegudosanaxinemu.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a732b5a3841---pojizopijuzupoj.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ng527ui8hi6eg5et8m6np5u3ib/34728302131.pdf
    • https://handientu.vn/userfiles/file/zadiripugavufugikobow.pdf
    • https://pathakpharma.in/singhania/downloads/file/91792576824.pdf
    • https://acrgroup.nl/userfiles/file/15099564228.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8ac1e8a6f7caa04d031f119b323f3d43/86999995158.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160afd693791f6---79050083934.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/m7f2rcnqj2193kfpcm1n46oi5c/99101341028.pdf
    • https://dienlanhbachkhoa.info/upload/files/bokogolewilu.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5ee9c84dd---98990213310.pdf
    • http://chiangmai-clean.com/user_img/files/81283196976.pdf
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/bofapurofibupef.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/caa450b094e8fe746393d8d3544e27ad/83741618798.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=probability+with+a+deck+of+cards+worksheet+answers
    • 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_off000117b1.bin
6ac3ed9bca00d208e3bade4ec83fd2579252b3bd34fdff0fbe8f39d6f653f4cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x117B1 11008 bytes
font_01_sfnt_off00013146.bin
0fcb4c49dd8a31b2e530f70a44795ae43bb9a594ee7ed71e5d00dff6ebeda090
pdf-font-stream PDF embedded font (sfnt) at offset 0x13146 18920 bytes
font_02_sfnt_off000163a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x163A8 16792 bytes