Malicious PDF — malware analysis report

Static analysis result for SHA-256 696fcdcfbd46dc31…

MALICIOUS

PDF

94.8 KB Created: 2021-07-25 03:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bfc7d4175cc84b4f8614fe1cdf3c1038 SHA-1: 8dd42a686335effcc38ead77274f1abde3a0cb33 SHA-256: 696fcdcfbd46dc31089c7894d976dbd5a7e0a09811167c9d58e94b3097354e4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised WordPress upload locations and disposable hosting sites, likely to serve a malicious payload. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic suggest a phishing or social engineering attack, where the user is tricked into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c373b718a---9598389125.pdf In PDF document text
    • http://foto-klub.dk/userfiles/file/megigudegi.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/j05vlp91g1su8s5r0lirvrmhmh/54986596879.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608afb19a965f---gibedefaluwivupu.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/d84f83mttjhlkcq35crgq0h512/zajiwogikebanup.pdfIn PDF document text
    • https://7gking.tw/upload/files/bozaroxifotavosu.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b147a0484f4---61166246664.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/vunupomutopuxegi.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/tgj6qko9rjnnrkphr8pdptv204/79000400114.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1a217c99d---94198202534.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/76972483824.pdfIn PDF document text
    • https://esvigo.com/upload/files/ditavoxerorite.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/3d307748eb3b19a7f75733e7303c4cda/71136106017.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/teziletababobok.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/tiponomuregezokuw.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94769bdcb7---56924147780.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/10335509598.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fa5b45207d580a7d44e898d93b62b8b/razeku.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26cb5500c7---jirukikumaduwugosuze.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074b4f27da8b---4029646699.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4bcd3f9157c47c94d4c893f7a59fc051/49277662116.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/zedatosib.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cf68d143e---85939215217.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c911bb4eaa---turavulawuwutidibufirivav.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/23643819155.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/25064136172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+clean+primo+water+cooler+bottom+loadPDF link annotation
    • 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_off00010eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEB 17268 bytes
SHA-256: c06e7c7627bdb6d93f09b1d0bb54e972f313c3ac6fb48f44f740ab9acf4d7b1b
font_01_sfnt_off00013c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C35 10724 bytes
SHA-256: d14245914084c1b9cb145b41bf66e8f2d37948cbe1a7b60d4ce4d00a2241f0c6
font_02_sfnt_off00015489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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