Malicious PDF — malware analysis report

Static analysis result for SHA-256 1796b4c173f44ffe…

MALICIOUS

PDF

76.6 KB Created: 2021-09-12 09:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d0dd4ce42887676997bcd6fb72d6ca4e SHA-1: 38b5b9e38f5e5b83acd5a4081717fedefe21c0e3 SHA-256: 1796b4c173f44ffe80c235613f18c62a3ed823f7881b42cb72ca4d8273c2fc8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thebillionbottom.com/business_school/uploads/file/24032286132.pdf In PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d963e5aa8c---xararezilewoxan.pdfIn PDF document text
    • http://ustunongel.com/image/files/nujibimi.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/kegilowajifebasudiwose.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/tizebagojasuxad.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/febenazepedasupemedol.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/dopevekoro.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/lisanapaluli.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/wunopamurasutuxer.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/34078946450.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/lugukelupi.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/98132752879.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/10353143538.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/63549147100.pdfIn PDF document text
    • https://eslms.com/userfiles/file/60114068443.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/6959uqblh36cvgajmft2eh6j3k/midamasomidifexubejo.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/4870357415.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/dovopinalisu.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/wogimatumobinawexa.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/56397456159.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138dbc09185c---vapoxaliliwofavodomaf.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/u4gqkq0i9ptkgo2a1o7d6kmqh2/82860514858.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced444049f---vopogobumapoxevapag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=yes+movies+unblocked+proPDF 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_off0000c9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 16568 bytes
SHA-256: 166346cdcd3c1d23003577db8ac2d5c6de463f56499a5db37382d5e92b64124e
font_02_sfnt_off00010c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C90 10796 bytes
SHA-256: 88dc9181e5ef43fa352c654020b348225b8c7b5f1d0202f41d3e03022511b68d