Malicious PDF — malware analysis report

Static analysis result for SHA-256 815f129b76d23e6d…

MALICIOUS

PDF

90.1 KB Created: 2021-08-05 22:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6504112b033ee4e38187f9de97c6a8aa SHA-1: d1bddb6068622ea000cbebab4d70fbeebd6f5a2d SHA-256: 815f129b76d23e6d6329c1d7c087e8b1936064d4a1d10920175d5b7625949742
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious documents. It also contains a large number of external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://crysiq.ru/uplcv?utm_term=mouvement+rectiligne+sinusoidal+exercice+corrig%C3%A9+pdf PDF link annotation
    • https://bloomeng.com/uploads/renizaxepogerativis.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeef1a82cbd---nawadotog.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6a7a3a94a---tipojafupuviwede.pdfIn PDF document text
    • http://salkim.com/userfiles/file/12860443087.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/jusofidobidulamot.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081f9758b70f---98163344656.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/kagixixawodal.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/2513166467.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/11895725863.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/38919346108.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8133c57bc6---1248061382.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/divaxuzoji.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/limifiw.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bdf3196b8---zorexegiwiwo.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/40069253856.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1adb325fae---povezenipowatud.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/81flpfsl4539m8m0855p1lpg0e/widulizurofiwoxejeduma.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d2b7f9ab7f85f22bf4a837bbe886972b/69995422515.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/53904568754.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a40aed63---jadekolamoxetugisiki.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/b866a3aca98f5eb921b70a9e50b87622/98311265275.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/fexig.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_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 20420 bytes
SHA-256: de9aa979fa7e3d9863f1e1e5260e80311b3782df6017a3a39d866ab05fb0160b
font_02_sfnt_off00013d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D16 11380 bytes
SHA-256: a27cec051fa9ff62f72a007c147fc31e84fc49e803bc07d5deb2ce53bc1c514d

Open this report in the interactive analyzer, or submit your own file for analysis.