Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde6189946e3a6bc…

MALICIOUS

PDF

86.6 KB Created: 2021-07-13 23:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a9b40015d80e5d13205f784ee3727f4d SHA-1: 33291d1f6da46ea442412f8b74748dd69d5464fe SHA-256: dde6189946e3a6bc31409d656909a1959ebfda08bb27aaa594a922ae5566fbf0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, exhibiting malformed stream lengths indicative of exploit code. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2udcup6amvbi7a6gc5kn6apg34/dojame.pdf In PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/9268893115.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b455778df28---66830755106.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec2237b78b---xasabinimupivar.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/jijidukenoturabimozorotu.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b73301f289---nifufajuzufomu.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/1daba45ede3c9a21333979a6320ba2e3/81956030453.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/io88rs4bglggukht3410gkclp4/wefokamalafix.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1a64bae3f977a4e8dd849676444b03f8/27348036339.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db465a7a110---riwegetosafuligerolale.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/63215859717.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/20283978854.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/monexuv.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/nalofuno.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160988ad0a9a5c---8460595550.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/87391949474.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/cde03b8c4a81d5e1a16b8673e2a1f92a/99776404098.pdfIn PDF document text
    • https://trexanh.net/upload/files/96574706384.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/13241396813.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/440vt6i6iu3g7tqup33if7f8a9/50539777153.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fab0b01336---rorireverafozan.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/110ff6d14e0bedf8e5cd750255149750/bukadidunirutegi.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/xefugesipabizolefajen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pdf+and+phpPDF 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_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 18332 bytes
SHA-256: de99029f3b65fef0165797348c2d5ac6793c158da69ef1ec5c230bd15e64e79a
font_01_sfnt_off00011fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E7 9840 bytes
SHA-256: 1da7b69e21526a1219cf64621b9e28810188e6d00c4f470c6c1797f8b091fbcd

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