Malicious PDF — malware analysis report

Static analysis result for SHA-256 282e6b71a5342b52…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 00:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 490d1ad3dcdd1be66c35e941085748c3 SHA-1: 2972364f507064b5a69ae49f430fa99dada53fd1 SHA-256: 282e6b71a5342b5216be6adf112e24adeae1080b4fe7ac55deed487c69dd43a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs and link farm heuristics indicate an attempt to redirect users to potentially malicious websites, likely for phishing or malware distribution. The presence of external URI links and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=watch+free+walking+dead+season+10 PDF link annotation
    • https://vnmmalta.com/userfiles/file/sawifonali.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/58efdf394f3a0d5717d62f7fa1018632/7255847829.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eef285a3a---63183327129.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/944af4b625d84ca1c94c27c3a86f8945/82303092970.pdfIn PDF document text
    • http://vhz.cz/user-files/55246407.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/g6471tfcc4a2vl8jd7n7vn28gm/42602225400.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/negiguxawuguxivinagik.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/nenuvawapumi.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/52081351158.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb5345761a---23332377363.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c70c4dcf6---beriwizofudominexegasipop.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210902/0430589388.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/sivadikaxezejonoke.pdfIn PDF document text
    • https://maria-galland.ru/files/file/53588118051.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/womagitelu.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/96376281661.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/sozobobitakotojovol.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/53521628997.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210916150916.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/dimajaroka.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613664a81f22c---lofubeponagi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138a7dce850e---47463258696.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_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 11100 bytes
SHA-256: 7df0f5a2a021a272c218ecb733963f16142238629f73737510c0359f5c9c9b07
font_01_sfnt_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11384 16852 bytes
SHA-256: 72b0e6e026ae09ab35d48b1f633d6d13f4d026b6c2276ac48bde1bdd6ffaa3d0

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