Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5d7320e2c41d65…

MALICIOUS

PDF

84.8 KB Created: 2021-09-15 17:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb89ddb4ae5bc865eab39b61aa317020 SHA-1: 2a5398f12b773e4766e6530dadf7f62c0c921153 SHA-256: 5a5d7320e2c41d65f8d3d6cff711331ab9b1d1ac97c5220ffece1832b3a2b0c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=dream+league+soccer+100+rated+players
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389cb480ed3---61546171361.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbef08df4e---wusekifijix.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f20d62f13---taziw.pdf
    • https://xn--lenachatka-57b.pl/uploaded/file/64697347444.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613108a048fc9---boxafof.pdf
    • https://ww150004.linebot.net/upfile/files/20210907151140.pdf
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/dugilitalu.pdf
    • http://www.scea.edu.mn/ckfinder/userfiles/files/satutogabolixizarof.pdf
    • http://asiavent.com/UserFiles/file///faviselajuzekezirod.pdf
    • https://itexpertdog.com/upload/files/70656826191.pdf
    • http://jamalcar.com/userfiles/file/javugoziguxaz.pdf
    • http://turagent007.ru/userfiles/file/72921635417.pdf
    • http://someteme.com/archivos/_20210907171848.pdf
    • http://papienbanana.com/user_file/file/sujufikolulukixirovisewi.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb3e248ad---liranedafasenipipo.pdf
    • http://ned.ru/uploads/files/rekini.pdf
    • https://sssmri.com/ckfinder/userfiles/files/98102385520.pdf
    • http://leebyunghun.org/new/upload/board/files/94518910639.pdf
    • http://sanraimundo.cl/dyn/uploads/file/16198548130.pdf
    • http://smartdeal.pl/files/upload/files/dexaditawufaraxojem.pdf
    • http://ancheng-medical.com/uploadfile/files/wegexotuvemam.pdf
    • http://abwrosedale.com/uploads/files/mufodapelipuseronarano.pdf
    • https://butyfarm.mm520.net/userfiles/files/tegoxopek.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_off0000e1c1.bin
c84dbf5bed961c51e9d61ce693e25ad6e27713ada2fbbdb29e427c69cc05face
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 18920 bytes
font_01_sfnt_off00011397.bin
8e3ef5545d959f5930c69e03f4117d8b7d3552d05db8faa5bbc2cff1f2444b03
pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 11048 bytes
font_02_sfnt_off00012d3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3D 16792 bytes