Malicious PDF — malware analysis report

Static analysis result for SHA-256 272fbbc2cec799d3…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 21:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e61e93d00e23bfaa0801fde7c26de879 SHA-1: 03850437befb5b40cdf247b4559819b6047dc9ca SHA-256: 272fbbc2cec799d37ab01f49aafeb085bd6d142cd0388f2dc79571cd9fe11be5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://nitexprofi.cz/userfiles/file/1447985873.pdf In PDF document text
    • http://caytrong.vn/Images_upload/files/bibebizavo.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/gofewubamutawowonabi.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6f7ab49fd---saximazixezexalevapef.pdfIn PDF document text
    • http://full814.com/upload/files/xenesobixexek.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/66415458644.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/bomaw.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/lojaveneladunon.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/60108080410.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/gamasi.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/kumezivepalitekepunumasu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161427501e24f3---davegajekef.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/wopobu.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad52bb6f7d---69479864216.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/kuxuzekujorajora.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/78710421097.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/82233991654.pdfIn PDF document text
    • http://talleresjpg.es/img/file/13385590532.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/20670421408.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///sowekur.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/6824831376.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/61697245907.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/20466161282.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/fonofasemo.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202193057218803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=promo+codes+for+roblox+2020PDF 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_off0000b1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FD 10668 bytes
SHA-256: d58513604d88d922d39432a0b6bbfd49e46145a1f461f86b0deb79f0ff4202bf
font_01_sfnt_off0000ca7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7E 17596 bytes
SHA-256: 736caaa14f0f0f909f2b34030869d95dde58b9c749e3e25d8808097c5c943709
font_02_sfnt_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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