Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8908f07226a229…

MALICIOUS

PDF

80.8 KB Created: 2021-07-06 04:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f61c0e8fc23e738d1b475610d9668634 SHA-1: c020b42af9f5d5d4c889ff8f5b21cf62367c6860 SHA-256: af8908f07226a229eabee3dc19e950bb2bc690a202edb59dec35b564426d2674
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting it's designed to deliver a secondary payload or lead to a phishing page. The heuristic 'SE_SECURITY_BYPASS' indicates the document may instruct the user to disable antivirus, a common tactic in phishing and malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075b47bbb4a5---jodadatunupa.pdf In PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/810ad76fae5e4f7a268ba974b87f1949/pasivoxeribu.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/3eq6su1cvq1khegt9bkduvcea0/46199036025.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/dodomomuvezonepapiwosudit.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc72d43be0d---vajekisuwetogu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc61caf1b0c---soduzutofuxulunuwiweko.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d32eefca54a---12986843617.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/24185614963.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/suvawosuxikonitosa.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/vedemabexu.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/58344816375.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///44404296726.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/fb82ce8fd1754031f5fa2fc875d5c714/29895441292.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4e846c44a74b7fa46531d67054d2c0cb/42225751832.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/99325107440.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c69f7ee2bc0c050be03306ad56fd5917/tolojekulil.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/puver.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/64823069097.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/37068550567bc3bc3415310d948a3afb/vofevuxotaxi.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/vinotomosun.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/67547560568.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4358e7e78---bisowowofumedes.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/ed3fbe677ff0cd2a07706fa9435f64b6/81369199700.pdfIn PDF document text
    • http://regmac.net/userfiles/files/rimebo.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/75369720285.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a2c7f65ef3bb3753b78e1819a10e0217/likizelidamedibekef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=street+fighters+unblockedPDF 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_off0000d3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 17876 bytes
SHA-256: 7724287380769880c8cc936b1bd5d7f4af81d7d6b802d423525158106a644906
font_02_sfnt_off00011b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B45 11000 bytes
SHA-256: c8b1fd405464ea1e7f93f3a84ac1aff1957bd9d52fe7a9e86edc236e6279b485

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