Malicious PDF — malware analysis report

Static analysis result for SHA-256 6231c14528283621…

MALICIOUS

PDF

69.3 KB Created: 2021-09-07 17:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f03f0d70d91ca772da79994d235d1e68 SHA-1: 5f1ac1664dd9798604094fba0bee72a3f79e49a6 SHA-256: 6231c14528283621fd305d572613d17f51dd967dffd2bdb47758917dd784dcfd
176 Risk Score

Malware Insights

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

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous links to external sites. Several heuristics indicate these links point to compromised CMS uploads, suggesting a tactic to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c0755fd63---jonunepuradupuzeziluma.pdf In PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/4r0mtgq52dvb5bk6jp0shr47d6/sokibotowuvive.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/93982f93a449293b58bc7c88a6df8870/sojenejajusejiwu.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/31885748750.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/91980045105.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16086b8e9624c7---zefubototegavemosunaned.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6b598f38fcba2b2779e452e8e3fe0937/segavoduwupoludipeje.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/22389144081.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/besamolazupuwamutireve.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/85063389509da801e15b75ec5bee7c92/77430020334.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/kelukuxakefawoxime.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8f29d649e---rufotukonotixeku.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/514aa63722d7dd9f329ab36e457aa513/nuxofinodur.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/11503141881.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612a35c913e85---popaxaxivuxekeso.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077706a4daa5---7137851928.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/u2586emp66peofh2hlnk12epe1/71178328402.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/nilesaj.pdfIn PDF document text
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/96597921304.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/32365091100.pdfIn PDF document text
    • http://maydangson.com/vietkiendo/upload/file/98571510603.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/fotejuw.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/84240205468.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/wafifotoxa.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/vusuxagaxeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=stem+cell+culture+and+its+application+pdfPDF 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_off0000b3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C8 14168 bytes
SHA-256: 9f5fdc4363d779350c2859c2e984e0f8bae349d279bfb32799c7c7f0b3ae90fd
font_01_sfnt_off0000d665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD665 10956 bytes
SHA-256: 3ba1eab9341ac84da704077986194bb1a27835bdbc867886a1178c69ca949818
font_02_sfnt_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1