Malicious PDF — malware analysis report

Static analysis result for SHA-256 e30bc85676f10f44…

MALICIOUS

PDF

88.9 KB Created: 2021-06-25 22:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f4153d92a34b0be2bacba9d73aa4e99 SHA-1: 49050c86e90062fc7144cc0a32a6f68eb4552764 SHA-256: e30bc85676f10f448e4023cd4b2cc067bafa1c4dfb67b840dbd65749baca6b5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a high number of links pointing to compromised websites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further indicates a lure to trick users into downloading a payload. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest an attempt to facilitate the download of a second-stage malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=computer+graphics+lecture+notes+pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/571b6fa699595d0ce915f57432f9eeb7/pifusatazizaxofekafa.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/38vdi5nghogpj50kgkhu2m8e6b/ranodepus.pdf
    • http://youngshiny.com/userfiles/file/1621244000.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/71725acd0ca03c1f7c449680015e44ee/dagixuvutugiwiwoko.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3726677b1---64080028018.pdf
    • http://thucphamchucnangmy.vn/uploads/files/boduro.pdf
    • http://aqbnb.com/uploadfile/file/xilugisawipateroruke.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609144f6a7fd6---54780655574.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2e2f41923---janexevojo.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608076afc1f9d---59555202444.pdf
    • http://abc-tel.ru/data/File/faxivojekujisisebem.pdf
    • http://myucmas.com/userfiles/file/56317281427.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe13d45cad---98530767214.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/51468157671.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/nefesufefalim.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d929b7fbb---15341167995.pdf
    • https://pnp-studio.com/fckeditorfiles/file/80150142519.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/0c9725344a0b6f4ff7e56321ed5b1296/8406610477.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/1mhhrnekrgjmf3a8fm3r729pka/wemegetiton.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762ca21d287---65385593508.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/97fa6d43e83b396aee16e7b39d1e324e/93043368803.pdf
    • http://ahlhy.com/uploads/file/031853224005.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/52e5843482d6695d244df9f7a874fe89/gixemitizasitupo.pdf
    • https://aznamaste.com/ckfinder/userfiles/files/zipimuxid.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5cd.bin
b9dff09fe941e96a46cd1aae8ff9a0d5c65310185456364f7d0b3f4d8f2ca810
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 17760 bytes
font_01_sfnt_off00012447.bin
3645f12c7644fa80d3a19495553a4601351bc9ae860486edf12e3b0089d70cfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12447 11200 bytes
font_02_sfnt_off00013e1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1F 16792 bytes