Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3238fc0a838f144…

MALICIOUS

PDF

73.1 KB Created: 2021-09-30 22:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d16a39d41d26da1407bbeeffbe6ee8ed SHA-1: 9165d6064f58a81992e3a5ff88f429e2b1b04081 SHA-256: a3238fc0a838f144d49c9cb6321a229de4610ca0e4e0d23969375666966a4524
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 compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://flirdining.com/uploads/files/lutudaje.pdf In PDF document text
    • http://mt-filtration.com/uploaded/file/6466106546153670642325.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/movomowaxezagugusin.pdfIn PDF document text
    • http://weldingplaza.com/files/file/78729698559.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/2abee43985e3e177800c9d87a4f6e178/suzipow.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/59001552739.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/nelewamasetilom.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/mepojobakoxop.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471f8fab09e---68199492447.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/48991175426.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/43414503081.pdfIn PDF document text
    • https://businesslife.com/content/files/buroxikamizesama.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161347b4216018---biwuterenesawumaje.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/bomisufexudopukezodeven.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/buduvatirebafojafus.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/84087418613.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/tewiw.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/3793071626.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/45495802290.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/sudopipeloxipefenesetavex.pdfIn PDF document text
    • http://specimport.by/files/files/batamejobe.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/gewotobuladazunubabuxuju.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/70580920244.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/83291402737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=aim+tool+for+8+ball+pool+iphonePDF link annotation
    • https://lapdonline.org/file/48395339459.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_off0000b6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CA 10784 bytes
SHA-256: 0b079b28c57436655442eac7ac713bd8d736773015387a53ff4295c9f2ee14db
font_01_sfnt_off0000cf32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE744 17604 bytes
SHA-256: becd64a1865834da824a14f77f8df8ae4f3234d5877ac1efb33e6a989d0fab8b

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