Malicious PDF — malware analysis report

Static analysis result for SHA-256 4839a321686d89a2…

MALICIOUS

PDF

85.8 KB Created: 2021-09-20 04:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b23e4845faa9ea516ea43d215406b07a SHA-1: fe67786b9f6a881071b4e79a8427cb7a8d1ed745 SHA-256: 4839a321686d89a239167da297b5d29e70c9307a01e46839e2c5fc0f4e8ce553
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous URLs, many pointing to compromised WordPress uploads and disposable hosting. The document body was unreadable, but the presence of multiple external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/24b4b8d27ddd354017659cccd806c620/didazafe.pdf
    • http://ekorob.pl/userfiles/file/petelalepirojirub.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b14421c62---74572451755.pdf
    • http://hypotekaprezamestnancov.sk/res/file/sudodemisuniwugifigozi.pdf
    • http://stefani.cz/fck/file/disepexonorus.pdf
    • https://cauthinh.com/luutru/files/kukarimenigilu.pdf
    • https://woodfur.in/userfiles/file/fopajezaxefu.pdf
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/43539637327.pdf
    • http://bannermaul.com/userData/board/file/19738161387.pdf
    • https://tectrongim.com/uploads/file/83073229192.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2fefa863b---51149645808.pdf
    • https://sanagustin.cl/files/serigag.pdf
    • https://hanyauntuktesting.com/contents/files/xekajikowodota.pdf
    • http://fsgpj.com/upfolder/e/files/20210903040313.pdf
    • https://diarch.in/WYSIWYGImage/file/dekel.pdf
    • http://bualuang101.com/backoffice/upload/files/26474668918.pdf
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/furanuwutog.pdf
    • http://swaminarayangm.org/userfiles/file/27632551205.pdf
    • http://ljjxmining.com/uploadfile/file///2021090221201021.pdf
    • http://meijialx.com/ckfinder/userfiles/files/96247827620.pdf
    • http://china-spec.ru/userfiles/file/20790861683.pdf
    • http://ashokarefrigeration.com/userfiles/file/jogub.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=which+is+the+best+android+emulator+for+low+end+pc
    • 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_off0000ebc5.bin
b136deee76ac11affad4f01f518cf3dcaff0cd84c4f1faec102ee0ed280c4b1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 16784 bytes
font_01_sfnt_off00011737.bin
3e750e358bfa89a6c5b1e8bf84f01b85e233c0e388a7d767c5b2aa273d008e7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 11204 bytes
font_02_sfnt_off0001311a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1311A 16792 bytes

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