Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a06ed9e30a6bc1e…

MALICIOUS

PDF

104.5 KB Created: 2021-07-04 08:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f877e2b2cddc0f6b9491307d0d8eaf1d SHA-1: d66dde29a425b75b68fa3cee5f47bd729d5342fa SHA-256: 8a06ed9e30a6bc1ea4bdaef09cf27eba87d7bf9edab4b92d5e7115085184ae84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=can+you+reheat+frozen+cooked+chicken PDF link annotation
    • http://hud101.vn/webroot/img/posts/files/29361984345.pdfIn PDF document text
    • http://gtshotel.it/images/file/tegutepadagafurix.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/54492510310.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c3fc298bf---85135932524.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/26855867296.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/21292701770.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/pdphn9vr177u4fv9dtbc48i1a6/luleruwodalagonisiwaxakin.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/juxajilakama.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/8u9a36dn29k7ie0c4qlsp4i418/tatiduzajososekumutez.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/zuxagamabalukop.pdfIn PDF document text
    • https://bayramkaracabeton.com/images/Media/files/11656155964.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/vovadokasawaderimit.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/cc7f4892109f2489cadbed6c5f0203cc/bifiw.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/1940140817.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/fatuluxegiditimadazuwunit.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/rigilerofexuwupaxizase.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/8ca61a81254ea4c172786f7d4ddf829a/witogabasaxurugemekakowos.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13113cf9eb---tebete.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771849a9ad3---luguneleworidopor.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/domisegufexumo.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e62cb7dfe8---39252505832.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/67966659580.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882ee7336c7---sazenofimivefuwoliwomati.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/92544805493.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/39445250443.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_off000137fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15010 16988 bytes
SHA-256: 1fad69de0187a4142a90e3757abfc6d43eeff08918a37ee1f817802d6e0e847a
font_02_sfnt_off00017baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BAA 10756 bytes
SHA-256: b3c7c45e2982e9b54daa1807a7a693e8c7a09cd3b36d00bd105d93ebc8325dde