Malicious PDF — malware analysis report

Static analysis result for SHA-256 487e4798945d5671…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 21:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5bfb868df19606b2ce358e41b27ef443 SHA-1: 0650bd9bb0df61663de9dcf0e6383f84986f07ab SHA-256: 487e4798945d5671e8f490e89950f4bff25a93002eead21c273619989ff78a36
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://artvideo74.ru/upfiles/files/51366149153.pdf In PDF document text
    • https://poulinstrapscan.com/userfiles/file/jonakukaxuj.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/56755563740.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/tavirujokufex.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321add54b47---19686909016.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/40579458412.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/divufodobetare.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/likifutirolozagefu.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/rigedadunigilurim.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/liporivoxobejum.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/zonugoxezojopokezo.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/87684432321.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/89102325405.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210903_6D2AB40452C0C21D.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/fasavu.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed67def96e---gipepejuwavufevafor.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/vedexusinepivuxosefezak.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/31042119441.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/fetokaj.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/41876931805.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/8602103572.pdfIn PDF document text
    • http://modern-pro.ru/files/file/garopifurisarafako.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/76qkimrsjm7vi5sgj3pda0tt8i/rotupolebepekezuboxekos.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/gitelixizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ariston+washing+machine+manual+av61PDF 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_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 11128 bytes
SHA-256: a5ed762b3c4b756e4fd001a4a550246684e13c2e997efed58c3ea8d40388e9f7
font_01_sfnt_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 17788 bytes
SHA-256: f13c9a502fd86cc33c102149eb2a3dca4ccfdce1aad069f6eff1945c53716eba
font_02_sfnt_off00011f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1