Malicious PDF — malware analysis report

Static analysis result for SHA-256 672084928ddf6bd7…

MALICIOUS

PDF

73.9 KB Created: 2021-09-03 21:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c3cc69d579e4de551c616679ef10cdc5 SHA-1: 64e4234f88a3e9130e5d446b1af0843a9bba730a SHA-256: 672084928ddf6bd7cf3b18bccb33eede5ec1b307e3b88388dadd42b1ad7d4064
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and IP address literals in clickable links indicates an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://king-pro.com/userfiles/files/vixugigi.pdf In PDF document text
    • http://debeight.net/UserFiles/File/nigaxugokiguso.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/86114923511.pdfIn PDF document text
    • http://bjjiffy.com/upload/zojelidewatamukiwejutob.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/91968261383.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/rasubofegikekibuxomavuf.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/6dd650acfd3683bd939f816b8814908b/9328682900.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea0f0a6629---pewuwilivowajewodu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b9e7a675878d16cdb8846ebca8335b8d/3808705748.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/vogeki.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c998a4b7db---80461250795.pdfPDF link annotation
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3b36ed276b0113c6aeb8a6ee5d0aa50d/lawapipebuka.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bdba9908026a057a19aeac7378498396/14562975339.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/36565655548.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2869f26d27---63994494586.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/36378954139.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/82807686487.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/tujejuwazakojipozanufev.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/jobominobovesaw.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/70199488720.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a76366bfa---lisuwejomedefogoxizisu.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/1127224512.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/78395645697.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/85233114548.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdd355e661---27041583625.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/bejokixokorejefogorata.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9afa3f98c566a413a0b75ab20dd2fbe5/nusunalafipemize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=produ%C3%A7%C3%A3o+de+alimentos+organicos+pdfPDF 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_off0000bd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD39 16364 bytes
SHA-256: 8da968c8ef95d231e8213bed70140ef979e38b814b83225513aee00d0970fcd2
font_01_sfnt_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 11528 bytes
SHA-256: 3e3eec3f789156c9f660bb1f9ce325ea50f332afe1ca5342e2337ab4f7ee4cf0
font_02_sfnt_off0000ff39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1