Malicious PDF — malware analysis report

Static analysis result for SHA-256 46dea6352ed87a4e…

MALICIOUS

PDF

75.5 KB Created: 2021-08-26 00:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 7e1bd44702dc11e2a8f80c770fc9f0bb SHA-1: fbdcb5701a1364e4e03fe8b658b38a99b0cbf9a9 SHA-256: 46dea6352ed87a4e1a54c2ffff1e36e53de5e5115e21a4418be8ea8a93afc92e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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://coretry.ru/uplcv?utm_term=solutions+physics+for+scientists+and+engineers+10th+edition PDF link annotation
    • http://coaching-scolaire.net/userfiles/file/28495458668.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86f469f58f---vekezutevumetenazer.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/wevetubemesipibopusi.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/a0ptuaav1i1acc77aja7rg024f/minizakezojikanaxuzogowag.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210717_001136.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/4864dacc861c6b74ec6ca864faf0e28a/23720580527.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/toduvigujosinelefusokegix.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ef2a9e393466fa3128e75f86b06b6abf/surutazinitujesodeni.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/818076bf12e93fe5a1ce99ef613511d7/jaxezovotaj.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae313c91389---jibojibegesamedubixune.pdfIn PDF document text
    • http://klefmarken.se/upload/file/xulugotijimifaf.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/37748058324.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c865ef75a---14322638596.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918ed88a03a---padekopotisumu.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/jagodujuwuv.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/bowavajuvidevebasulum.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/69947467171.pdfIn PDF document text
    • https://promise-land.com/upload/file/97487992138.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6a083472d---xawixatojafezazol.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106160058547177.pdfIn PDF document text
    • https://ivanamihic.com//files/29668099576.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/15906618355.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_off0000c267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC267 16504 bytes
SHA-256: 199b72b3a05dcfe667eed7782f1ea76fb87b80008bf9a1857de89bd3ead0c330
font_01_sfnt_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10574 11364 bytes
SHA-256: 86b3e9ee58ca5a1f5b5aa37fea50c7738d40df564e1902d06e0224f7ac092d74