Malicious PDF — malware analysis report

Static analysis result for SHA-256 27bf01186e469d4e…

MALICIOUS

PDF

88.0 KB Created: 2021-07-02 12:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 747beeea717ee9396735f0a48838cbab SHA-1: 11bb5c47fe42761703e92216e2ee8ca0457e42b4 SHA-256: 27bf01186e469d4e5a16e24a3563b63f913eb996a195b62a370918653434a186
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/56d86e3a0503cf317640f5d31f09b685/48914883450.pdf In PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ea8fee899---robejebura.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/32427695105.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/setaruvomejixen.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/70663072089.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/78441508558.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/413072f3cbd1d55ea29b482e9c5fc137/letapi.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608893d1a9866---jubexuguvononof.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d814f88da4c0047a1a7bd684b66252bb/nigizafebukawunoz.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094117872c73---benelib.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/d9bb9c5b90202fb4e09e3a3ef0cfb004/bedimazegowefetokixize.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/32236f8ce3dc7df36ab15c4a0aadbf9e/daredafukebitokom.pdfIn PDF document text
    • http://www.toptehnik.si/images/nudavexigewejezile.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/953b1cbc148e9526a5ba841b8f5ebb9d/48702489998.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/88718513715.pdfIn PDF document text
    • http://meta-min.com/files/pevanitixoweruzorix.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/89290498306.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/sakadategezuvifademug.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/87420747730.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/xurekubatipisedolebul.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/e6618570d82663add2db7c9d7a044b9a/bemawutoxigazelu.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/44191343000.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608327507a2d8---duxedetejeragemosuwenes.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609891a3cf7d8---5037477861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=is+msg+fatteningPDF link annotation
    • 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_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA1 10244 bytes
SHA-256: 9b84eace225ce6a119af559d393e5bd04ecbebbf619e611765d88d325a40c211
font_02_sfnt_off00012696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12696 17304 bytes
SHA-256: 022ca7dbae18594568dbb2a33340ec1a5e86e84ead1442c2ace91a3780860135