Malicious PDF — malware analysis report

Static analysis result for SHA-256 8492efc17caffbc6…

MALICIOUS

PDF

83.6 KB Created: 2021-06-28 16:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea0e39174fbb43ce7711ee8a07d6c319 SHA-1: 2c988fad6a6f6311e620e4ffa9457c3407e5c2d3 SHA-256: 8492efc17caffbc63a0976658731414bb51fe7cd864c29d262bd3fd8217215b1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable binary data, but the heuristics and URLs clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://adasms.fr/userfiles/file/wuvujolemafimizigaxi.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b0504728c46d2027db257c245806705f/zawuvokogixita.pdf
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/5523917982.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lsrs1imre33lra493tb55lsdh4/zagawesixogusugimosenu.pdf
    • https://elegune.net/files/galeria/files/xinowodolovoxe.pdf
    • http://irk-yoga.ru/upload/files/11716037779.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/331608a2bd6b8f321d79d7fdedefec0d/wukefolinipasebuxiveru.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/b36bdb58a790af838217ace08ab76178/jofobetawalewadiwe.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160980eecbd352---lekoragodopaxitugis.pdf
    • https://west-holding.com/userfiles/file/xumebajobuxavofixigigula.pdf
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/jumoputopotaperazituno.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ca3021b1e---11393556931.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/4ajabopvr68fa1uoo11k6uvgr3/sufimosoparesudeporesu.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/69d5bf40a03b65c74079808b2ace2f41/tikigigumaziranozuzu.pdf
    • http://lg-palette.com/upload/files/ziwafadujedorowipemugajis.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ef29128c6---koreve.pdf
    • http://airconbank.com/upload/fckeditor/file/22482044335.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/v35d93u3te673pr668cqk5c4n5/56316672402.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b2f6b02ff---zikemufibagifaxetore.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb54fad31e---34595500939.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/9f2fd724bf950a6a3db57cb97676c901/18658888035.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c98673b379---bigede.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f41ad1e35---bevune.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=human+relations+approach
    • 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_off0000e59e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE59E 16792 bytes
font_01_sfnt_off0000fdb0.bin
8ea28e0f3816e97bbb5f0aaf16fdbfd2f2474d464aec38c5cb7eac297fc1acc3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 16572 bytes
font_02_sfnt_off000128f4.bin
0db53566375f5d360e943d6bd7b1103e20040b26f01bb738ead7c38aace8d9ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x128F4 10728 bytes