Malicious PDF — malware analysis report

Static analysis result for SHA-256 a135cc77a03207d7…

MALICIOUS

PDF

88.3 KB Created: 2021-06-28 02:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb771d76de5cfa013b18fedf4e749948 SHA-1: 30680762645770f23d176e2aa318f309c69b4f48 SHA-256: a135cc77a03207d79b3c6774e11226ba05d705e86af15970de6151a3bcdf4ebf
196 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of 'cmd' tokens in the document text, alongside the PDF structure, points towards potential exploitation of vulnerabilities to execute commands or download further payloads. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a malicious PDF designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=adventures+in+social+research+10th+edition+pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090488228a66---tatufunuki.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5f7dc4a3---68596859370.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f14ac3fed---jiturojegeturaxebufalawi.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960eb128fdd---zejasuwusegosadafi.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fa6e34335---fuzifir.pdf
    • http://kaies.cn/upfiles/file/94160680248.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/c27496fdd17c857992b41d046c5ad2c6/10586086548.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/4038121b00998e33c40ffeaef3f968ea/mesenaga.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608687f9f06e1---57876444136.pdf
    • https://aedwea.com/upload/foto/kanavafiregan.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bb9c339c7---falad.pdf
    • https://daaeportrett.no/upload/file/74676075456.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/njj9k1m2dg1v0cmd3bk0enqlet/valovurenewa.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d6da12571---mikerozelazewaraw.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729b34e0834---bilubefodazupumole.pdf
    • http://bungefamily.com/clients/5233/File/didedawuvorog.pdf
    • http://montaze.org/democms/userfiles/file/voliberajofapebuj.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7622ab58fc---jelenenuruwavamajewo.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/7b6bh3l6khpue64gnqntk1v0n4/1014556979.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a92a171ba81b3017e2a2ee99921df8c8/23212617875.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608740fd3256d---40933890169.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a03a4574836ffd5cd282a6d425d9d43b/wasokajoguwokox.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/r64qutuvc1dsl0hsvc03pp32ud/56120800564.pdf
    • http://agendatourvietnam.com/hinhanh/file/29994738823.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9a9e02a2---27258179568.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0be8b772---26769089486.pdf
    • https://www.mercedesbenzofaus
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a58c505e0b44ec7ed7a62edf8983dd9b/razovawajikujimu.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_off0000efb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 16792 bytes
font_01_sfnt_off000107ca.bin
c46dc146b3c91c6e7472b8c1bf9568a779d66dd38eee650d504f690f83eafaa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107CA 19008 bytes
font_02_sfnt_off000139af.bin
a45bfb81cc7b2f6e285bc7ea87a718f4474d86060bf549b8c1773a93daaf35fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139AF 11036 bytes

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