Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c221669f5562709…

MALICIOUS

PDF

109.1 KB Created: 2021-07-08 01:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cd97b973582c07c0dde82b14b9a66082 SHA-1: f0351029552c392998f74da7f1e5b893470abce8 SHA-256: 7c221669f55627090c5d1d8b71706a7b1db163387c3741c3d7c6b71dfe5605f5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection to these malicious URLs, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://pescepiana.eu/userfiles/files/fukivem.pdf In PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0f56a5ed9151fc7649a12f980af53bdf/nonorijubumuvizerukuguwug.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfff037bd69---14963750272.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/fukimek.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/12413893433.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/1to675thke5dj6l2pa0vi9paij/38091747635.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/a9629f49127903809946aa52fc57f672/23681604970.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/93aad7493955e2bc2472d202991bda1e/57636963049.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/15932547321.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/b4d18bf2e79951ed8c69d04fdd52d1f7/tizojaterufoburafuxezej.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f4798dfa4b85cb3de8c92e1107fba373/54095585568.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/fotonerutisem.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077428d23d33---xojatusitetadovutudu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c631bf04---disevepo.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/binalabexemir.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4197ce41ae---56706062679.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/xefizuzaluzigavino.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085e96f245b3---buvidavagukugeg.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/qpq4dut8cl8cqf61phr7725721/57514160225.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/71665749350.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/s1sba4uamrnehv5s9esoiku0gb/61983488047.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/pti6jam8il9605jftompf75f62/xojurepavixenirukesub.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/32779550018.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/d06b990ti8b79nh4ggtdmrb9l5/nafab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=all+pandas+in+the+world+are+on+loan+from+chinaPDF 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_off000144d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D4 10952 bytes
SHA-256: 09031eb84bd1045e1993938944b04890849f7f0bd8dad175a2d2b05e5f32bf13
font_01_sfnt_off00015e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E18 18456 bytes
SHA-256: d17f9e57ec437234c7d1d2bb6f9213cba8741de8f6afb5da8ea26e6fcb2ea535
font_02_sfnt_off00018efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1