Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c109283746fbef…

MALICIOUS

PDF

82.2 KB Created: 2021-09-11 05:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3ae84f3e253d7cecd2ac102d83bc420b SHA-1: 3a7ddfb5ecf25ea1b9631c2bc05a782a21db8b9c SHA-256: 98c109283746fbef0ea89447a4f50b628a2d2fa807e783498b7fbed7707e7eeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to phishing or malware sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=google+chrome+download+on+android PDF link annotation
    • http://villa-carlshorst.de/sites/default/files/file/fisuwulapuretilelowix.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210911_D1FA75C1CD901F79.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/40132062893.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/74567021723.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/vuxazanepopixoze.pdfIn PDF document text
    • http://ned.ru/uploads/files/munumup.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/pewavimesirulefozal.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/36944866338.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/62250431378.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/zakanovusota.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/62232045294.pdfIn PDF document text
    • https://casaalu.com/luutru/files/fenuwitadakugiganiniwa.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/jodagaxirokov.pdfIn PDF document text
    • http://rayanchem.com/d/files/39626819614.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/19811579174.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/010958258092.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/torowexe.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/c99946kifdkuua82jtr985gqkjdtcsjj/5772570718.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf5482cc4e---gamevujuwaluvubiw.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/4985630501.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/p4ngjp9rt2usk4ghppa6hd48vp/59351581836.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/ebdf1b2e16fb26a0e07478de6b342a15/wurotikakirifa.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/66664226307.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/4bb3edaf4c8766d2f142ffce15c27547/33619152160.pdfIn PDF document text
    • http://irollee.com/userfiles/file/xuwoforizilumozufukut.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_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 16844 bytes
SHA-256: 19b9c63daf3245c921bc859d486f8eae397a627054b692301b70ece7f2c17f46
font_02_sfnt_off000122ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BA 10676 bytes
SHA-256: 10bbcb45386a990b93bac864700dae6db4153eefe706eda2eb004a7685da4031

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