Malicious PDF — malware analysis report

Static analysis result for SHA-256 509361a939e3cb37…

MALICIOUS

PDF

80.4 KB Created: 2021-09-23 14:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2935ff756ed193d96fa8932c837950a SHA-1: 885a9afc9f16f84c60c986218f66dc0f315c5d03 SHA-256: 509361a939e3cb372eacb14a1e587fdcc43f5bf56ead383ded578137a4216118
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://garglob.ru/uplcv?utm_term=aptoide+tv+not+working PDF link annotation
    • http://lerucherdesanges.fr/userfiles/file/zodarajofomeviliz.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346766db567---najimimuduva.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/puwalogesukudugedo.pdfIn PDF document text
    • http://upakuika.com/img/file/kowurimiwur.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/99976445726.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/biwidudaxos.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/kujoviwepun.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///xolalubibugo.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/xagon.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/dunarizotuwok.pdfIn PDF document text
    • https://harom.ro/files/file/zuriwupixojanasad.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/lotufeladoreketijipowired.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/1088a27e0e1efa35645993a82014f95f/zakimogizowakojiloxosolap.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/34738243579.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/15386940383.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/durefopukumufijinunig.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/52004912786.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/15978978130.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ulmgs3uejsig9t4ad8nccdqv0p/76774094057.pdfIn PDF document text
    • http://flirdining.com/uploads/files/lutudaje.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/64238847132.pdfIn PDF document text
    • http://asustainable.com/global/file/48445509637.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/mlbc1ma060dspm74kpcdk7ji71/35613136197.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_off0000d7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 17424 bytes
SHA-256: b4c1a060ca7ad4452eb3f0df3fdcc5fd3c3074bcaf6b2ee9704d990eef69fba4
font_02_sfnt_off00011d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D04 10416 bytes
SHA-256: 3a084865a6f21be8c9a8c1377064ce408fcba88330a395194716de846ebb2555