Malicious PDF — malware analysis report

Static analysis result for SHA-256 90340ea301267b90…

MALICIOUS

PDF

88.4 KB Created: 2021-07-24 01:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b600bd5e9adc6d73ee97f3272af92a2 SHA-1: d721bd41ddc1ceed2dd1fc3e8f5ef5d52a58e523 SHA-256: 90340ea301267b90c1c9e63a760626872982ddfda7c532c51cd9ee56735e63c8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://detectiveoffice.net/userfiles/file/15923353682.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6316bdbaa---savitomegelufetagujovon.pdf
    • http://resheto.ru/users_images//fck/file/68605489987.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/07p1hpt70ftquvgdenmi7r0fps/37790315295.pdf
    • http://brilsports.ro/userfiles/file///xadarezutelufafepazowakim.pdf
    • https://atamergranit.com/userfiles/file/49937919070.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073b4ed99067---bafopi.pdf
    • https://nhadatonline24h.com/Images_upload/files/80697780029.pdf
    • https://clap-bas.com/userfiles/file/pivajifajexizowowejipeju.pdf
    • http://swaminarayangm.org/userfiles/file/15748069463.pdf
    • https://rasathantrananotech.com/ckfinder/userfiles/files/75401812032.pdf
    • https://rijst.nu/userfiles/file/93549786855.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160747f79a4a4a---20141216726.pdf
    • http://banphimchuot.com/userfiles/file/88643499051.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ac5j441f69oi260s7tmkot94pk/17312588535.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65cb2d564335cb6c7531c07112110f03/95645788978.pdf
    • http://samafb.org/uploadfilefiles/55222895007.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/5um6rmi8g7b9sq8hdftvcggvt3/zekufemasesa.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/u45d2jpctj0f3mtj0342l3i9j2/31282301728.pdf
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1626121596.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/elp95bor75gq4j36enkjo3s6jg/67608478975.pdf
    • https://jagominum.com/contents//files/xugafo.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608877a5c73a5---dugiwizoniruduze.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862de7e02bd---17062952600.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2940ad0c8---nifewim.pdf
    • http://poorclarescork.ie/images/13207631879.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=wwe+2k16+download+free+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f218.bin
b945e3b6cbf776f6f92c1747561705a104ba457a0e143608c605cd244edbefe7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 18496 bytes
font_01_sfnt_off000120db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 16792 bytes
font_02_sfnt_off000138f2.bin
4e9a7f9fd6659fac3ea85901a79fa8c73aaff1babd724c3e3ec6b7e6963fc4e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x138F2 10592 bytes