Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdc44babc8a5642…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 12:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e8242b38ab18c9536d8d19d8c9cc994 SHA-1: 76cb9f2c4dddbeae85dc4425421d3d96980fe611 SHA-256: 6cdc44babc8a564297432245e424eeec7d5b52a1819c14a51bd8d2f4169afdb0
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://china-engine.net/ckfinder/userfiles/files/7796273922.pdf In PDF document text
    • https://imihwa.com/uploads/image/20210910/files/20210910050723.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/45794076183.pdfPDF link annotation
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/970d83ff4969e9f0d21624b1a8c463c6/52876892617.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/60079246519.pdfIn PDF document text
    • https://cargotavio.ru/files/file/41331208787.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614263e5df043---ginoxonuvivulune.pdfIn PDF document text
    • https://hoavily.com/uploads/files/waperetafaz.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec5727b44---63287508009.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/xefojikofepepiparan.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f5fd8482f---67015326965.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/tijijonuleruli.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613436fe00281---88191809211.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/41588595860.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/sudokat.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/jixetixofogatoboxo.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/domenatubedajedepiv.pdfIn PDF document text
    • http://asfalon.com/__files/file/gevulewesagimekajane.pdfIn PDF document text
    • http://debten.net/UserFiles/File/36559320397.pdfIn PDF document text
    • http://actinq.nl/upload/file/risavo.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/suwawa.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/dexuku.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/kesatifovinarupemofoketu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=fowler+refactoring+2nd+edition+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_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 17280 bytes
SHA-256: 85d899c0bb350b5dc699bb331c8ffce0947e344a9fd236265a1a46e0daf5274d
font_02_sfnt_off00011d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D93 10812 bytes
SHA-256: ce2027832408ee12f9f587b2305082b1962d8309821dd348ec02dae1d8f1db59

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