Malicious PDF — malware analysis report

Static analysis result for SHA-256 118b2786b07e3a6d…

MALICIOUS

PDF

144.9 KB Created: 2021-06-28 00:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31371a251ec8703eebaf19df0f6538a2 SHA-1: 1699314b64878929e11d8078dd777512d3e70bd2 SHA-256: 118b2786b07e3a6dd3fb3aae2d6485273daaa75cbe13f77578bddac99de9ec89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://chcial.ru/uplcv?utm_term=dam+engineering+lecture+notes PDF link annotation
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/0cc02c24f7698393fc502a53f21d96d6/tegumoguvuzote.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a02a5ba381f---45109662051.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/rgru5gt6iek8sr54797ijenom0/jazuzopasatonilenom.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/55919372680.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada00e9f15c---jimidejumubaredus.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/5ca778a45471549dabf39fa998010753/wejadowiniruzefa.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083077938a2e---jatorasej.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c51ab6ac88b---zizepudadorawulakoda.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8f6b827f5---pegazadudisek.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa156c6260---gaxazukuxakujavud.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/xugotogapiratewowum.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/52037439161.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/pewubu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b367c08f2ed---59720511352.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfe0cc47de---79841785810.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/gub457c1c3luf32ng34gbn0ap7/88151741220.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/tuuchsqbpj47llllrkcn886j54/zoribaxujusoxupesibo.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202105306598_365523651.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/20290903857.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608589840648f---54522346176.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/b0gmb75i7ll2c2sk6peduot95k/39196621866.pdfIn PDF document text
    • http://chikatere.com/Upload/files/lowilaso.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/fizunuduvuno.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/42aabcfa854d80bdd6afbd0c0f082fb2/36928139594.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D354 19780 bytes
SHA-256: 08da3bb3d25141eec1642f144810b7d70d114bccc7d8211392a057e9e620314b
font_01_sfnt_off00020576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D8D 10676 bytes
SHA-256: 328b50e5b5981e561e9e62eb1669ed8ddbed9d1e2c3d8931dacb1851250a2c27

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