Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc284c0f978bed2c…

MALICIOUS

PDF

98.2 KB Created: 2021-08-26 01:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: fe7b58e1f3dfdaa5f2767adea7585204 SHA-1: 83ac91ed50a8fe4e108e31a60aead2a81dd214d8 SHA-256: dc284c0f978bed2cec38e4fdc0352ca53c548ca71ffdd12293b42a0b0d738241
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised WordPress sites and other potentially untrusted hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and compromised CMS uploads suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://karat-dobremiasto.pl/userfiles/file/3040208872.pdf In PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/b5c585a4236baf73c7d3ac3e0926ea9f/bumugepixokafo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/7199876164783f37b383989ab9166def/55937610485.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161237dab2a0dd---95809590208.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/fenelexabofu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a265593b2f4---54783043031.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4afc29f25---37097622756.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///2295889287.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/72367701577.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/kosoxifirisevubowumefizix.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/80106803618.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/vabujutefelezebawenetomib.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/95370885929.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ddfe5617c9233b917dd97bf72861a036/94797811348.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aee412ac1d87aaebca9ba5d4910eba01/31849622274.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/lajixibofaraja.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/pesinapabipupagajopibi.pdfIn PDF document text
    • http://learningkey.org/userfiles/74071580291.pdfIn PDF document text
    • https://sfilatinogourmet.it/file/68053011314.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/6404151912.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/jixoka.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf1b1debe---saduwifu.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32a959c26---70387702685.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/linemewekupuw.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/zivafuluwaxugak.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611290ca3ca7a---22647284812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+accounting+treatment+is+normally+given+to+the+following+items+in+accounting+for+plant+assetsPDF 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_off0001147a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C91 11288 bytes
SHA-256: 970f248d483573648ada73bec5e8ced56bf4111e106cdb0fba0c3c2c0c30b3a3
font_02_sfnt_off00014704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14704 18912 bytes
SHA-256: fcc5206f00f1804f7a140de34634bfb8304cff97e8e9b727832a7e8451b841fc