Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd30e1d2171d2f6…

MALICIOUS

PDF

91.4 KB Created: 2021-09-16 10:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d49b4e0c25c6de65f3876aaef2e971af SHA-1: 171c02b0bafb7c8e770546c69d3b65980ff1e921 SHA-256: 4bd30e1d2171d2f6acc3ecea90dcba22d0add5e2dad04a737523a03ac2dc31f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded URLs are designed to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1aa196a30---82717615606.pdf In PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/43057286156.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/43640925181.pdfIn PDF document text
    • http://balalajka.nu/media/gumewilokabopuxabemusoka.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/detawuzojus.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/68185702356.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/wepebi.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/74668674052.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613922b6d1b05---kobuwetonimaluze.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/49615407703.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131d83322cde---nujavepirinuviwixetokasub.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/4101539141.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/bipinipozonalisikufixaj.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/25972817034.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/gisinazizefuruganus.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/16538678566.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/53561926639.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/86564307906.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/puwotodupiguvonu.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/raxigeporaputun.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/vorotadomibabawukilez.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/80700203270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pokemon+go+joystick+apk+2020+iosPDF 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_off0000fe4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4A 11148 bytes
SHA-256: cee4c07fab431297ddf2846e15a1c87dd97a3bf7eeb070a62e817bd3f5e09e11
font_01_sfnt_off00011877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11877 18344 bytes
SHA-256: c2f41cd886e24746e8c02231455fef1b0d97913f8f001fa307c87d73217337d6
font_02_sfnt_off00014855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1