Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8343108e4c92506…

MALICIOUS

PDF

72.4 KB Created: 2021-09-25 13:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 455b8e04a99bf8e5f501c9baab6773aa SHA-1: a8d2b559ac5a63f2d4e6567f140982f2a9966023 SHA-256: b8343108e4c92506ff32c95366c3c4c3fc49b7763f305bc91a8d25976047d45d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://infrive.ru/uplcv?utm_term=meet+dave+tamil+dubbed+movie+download
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca811ba55---minegonak.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a03f2d4d52---tatamigepifodimebi.pdf
    • http://dxline.eu/userfiles/file/nibosivogeno.pdf
    • http://www.dilipprabhavalkar.com/images/file/fuwinefakep.pdf
    • https://keiba-like.biz/js/ckfinder/userfiles/files/lekerijidune.pdf
    • http://naim.naparts.com/images/fck/file/retamalu.pdf
    • http://grandioso.asia/editor_upload_image/file/kiwizutimuvudikok.pdf
    • http://eptesteplelek.com/uploads/file/bonapimokimagiv.pdf
    • https://romalasergroup.com/userfiles/files/nivevagitebe.pdf
    • http://valencia.thepokeluau.com/uploads/files/rerotulitakive.pdf
    • http://nuuts.mn/uploads/assets/gozonutegakatumon.pdf
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210912005336.pdf
    • http://ityab.com/cache/fck_files/file/jusojiwajorefavixokoweg.pdf
    • https://sklepbonus.pl/userfiles/file/xabokix.pdf
    • http://studiotecnicomartani.eu/userfiles/files/79391442921.pdf
    • https://guptajimarriagebureau.com/userfiles/file/90831204659.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a1930fd05---kolameta.pdf
    • http://holidayinntorino.com/userfiles/files/bujipuzejofojonitunududa.pdf
    • http://e-sportis.com/images/upload/774280913.pdf
    • https://yifff.se/userfiles/file/63929109089.pdf
    • http://tacchigroup.com/public/thread/risorse/file/nulufesedugaji.pdf
    • https://telorgabus.com/contents/files/niserijerafoles.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_off0000b3c7.bin
e27b95011f63b26ea7c1a1017d98f82a03afba2ec68b05f89321b48a547f2ea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C7 10528 bytes
font_01_sfnt_off0000cbb9.bin
d744b69f316b3256d3d4b813392305e79467f003de793c7534bab791edf8b160		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB9 18828 bytes
font_02_sfnt_off0000fc45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 16792 bytes

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