Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8bd195bef762dc…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 16:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b5751b9e9da8815e07b5a84dea8136c SHA-1: 50f5dc7d2933ec3f688092652a6a449afd811e46 SHA-256: 3d8bd195bef762dc1f4ea487cc022c2a9fd2d74754ce58e17c989a3f19602f6e
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=android+dns+ayar%C4%B1+nas%C4%B1l+yap%C4%B1l%C4%B1r PDF link annotation
    • http://likebarcode.com/image/files/20210908_193054.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/5432609080.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/28348437941.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/puvoximorivi.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/83319816965.pdfIn PDF document text
    • https://viceda.com/userfiles/file/10011521420.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/meganezikod.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/52617030106.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/39075662756.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/9865004161.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/81460131957.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/23224921987.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2f0e4c7db---60309271639.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/63214487369.pdfIn PDF document text
    • https://steammining.com/userfiles/file/gijavumavidaratilunel.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7aa6e7bff---67474588651.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/tijirobirefolakefibilen.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/najomu.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614294824cb68---91263934751.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/vesijezusumawumobepojelun.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/16545401791.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/37660284455.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/joxuwofosuguroneg.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/zoxenuxumupakabude.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_off0000d4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 18448 bytes
SHA-256: 1e7c348b6e726286c15ba3710f398f8db6d1a5220b892afacc142dd885e10e2e
font_02_sfnt_off000119c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C9 10296 bytes
SHA-256: 011a5b0605a6620d3a7630bc39d89032137dafc08a6001f09d30001206f22fa3