Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b089fa5ca2c3dc9…

MALICIOUS

PDF

89.7 KB Created: 2021-09-20 19:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f4ccf5e60c32109fe36054ca5d47951b SHA-1: c8366892bf3acb423374f9ff60050a68126ee4e5 SHA-256: 8b089fa5ca2c3dc91f905f210660f17f02d0d5c6e6beb45e7ea387631e85dc39
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on compromised CMS uploads and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=function+of+presentation+layer+in+osi+model PDF link annotation
    • http://thegioichuyendong.info/app/webroot/upload/files/pupureju.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/zorenukajeji.pdfIn PDF document text
    • https://ever-progress.com/upload/files/zesuguge.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xezukidupupudepituke.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/zuririvilazofusef.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/gedosigogupi.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/483db21de9cf04e89388e9ada278b188/widimix.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/lotug.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/97202752605.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/64592306976.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/24321297070.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/96929166670.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/73658970891.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/molosawisokurinisafuj.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210918115615292746454.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/60594508150.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613815efbfd21---90293954586.pdfIn PDF document text
    • https://samowar.ch/upload/file/tedokeralojikojinolu.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///81384148273.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/kusiwewujanajewofu.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/tiwilof.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/xeseb.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/sagutefosomobew.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/23df9a38af239e9e3e0bf0a07c5c2df8/likituxibaketimojot.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210912120655.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_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 10972 bytes
SHA-256: 08e5880f3953fc432e84d6cde3f6f2d4079ac2e6e3a0893db584898ba53421dc
font_01_sfnt_off00011434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 17188 bytes
SHA-256: 2c7a2d41124f99f27325b6a2c029beb9c5a4e6aae673ac9828eae43ff0367b2c
font_02_sfnt_off000140c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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