Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7092da428d7170…

MALICIOUS

PDF

85.1 KB Created: 2021-09-10 13:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 911f63c5777ad0660919701d9d33e1a1 SHA-1: 62e1b86a4bbed0c55390f6856711928ab305a1cc SHA-256: dc7092da428d717000c7c2520b3919f87341f5377db6fae5d28441d13e62971c
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download or redirection to malicious content, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=apne+tv+web+series PDF link annotation
    • http://kajo-frings.de/userfiles/file/5171850132.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/73245992659.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/padebipijikevetijoxumev.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae51e1b7a5---vetuvagurovaborixotabemus.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/zaxiwovapetasutofazo.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/90261242620.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/39985581881.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/moxizisipeke.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/831f3ed714900f0a4f61a30e366eee82/76153368717.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/60462693600.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/rusagipudijujusamozu.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090414050483.pdfIn PDF document text
    • http://pjteam.hu/uploads/52882787197.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/jodukiwibemol.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/riniwame.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/xevipemogipelulisuv.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161379e3e65996---50300834568.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210902163054888555.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/64275968301.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210904_000833.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/65438675972.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/32866879877.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_off0000e9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 10188 bytes
SHA-256: 35b7c77b4d79eb4a7a8525c6110fd0083564e2019b940ec7ed21c57ee09d682b
font_01_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 17684 bytes
SHA-256: 50f8380f9156aa40d155fe1f10061557b3f5482ebeb1df122c0caccea96a3098
font_02_sfnt_off00012ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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