Malicious PDF — malware analysis report

Static analysis result for SHA-256 983224ad9614f88b…

MALICIOUS

PDF

90.4 KB Created: 2021-08-17 17:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 70e47203437b0459ac7ab2760bba7f08 SHA-1: 1569f19150b7222c22761b07585ae2f3e6975cff SHA-256: 983224ad9614f88bcf55fd936bcc7a1aad2c8c9c3fa5d98b9e75b5ea4f065d7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised websites, identified by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab900792d4f8b4c6adb1745c10352f20/48871325074.pdf In PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/59956598389.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/63462656546.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/98p9sbgarcq3a70dp9i33426os/tezani.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/vixisukuvedop.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16110fd775ab6f---nileluwefobawal.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/munubeguxota.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/0f19e82502b1e3483e4e6143940a9818/zijowuzikesivenejawufa.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/01cdffc0e3d0c4f3898d280599f189ef/xubazetidimid.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/71pq7qmr6g3f9v6jf24i85q816/sidifosenusunewiredow.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210526214756.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ab8d871c7---sopepupofonupototikuma.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7f877f892e88e9634ffe787d8b5a9fff/zugusexufow.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a130bce30---20262744477.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/bafixirureluwamo.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/pdh0enu7r6sdvcipjpj1n7gci2/30873233264.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/45634756344.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/80420538050.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/30507725961.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/bizibijedimanavusoled.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160929acaddcb8---92709579569.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/fagefopoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+do+you+name+a+ray+in+geometryPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 17336 bytes
SHA-256: ec475e3b4b7e66021c811b4e742e6f080ec0501f12bf7c9d84349645a321869c
font_02_sfnt_off00012721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12721 17728 bytes
SHA-256: b168f3d6f0224bb4621c8945f9b8a523306f75009b3dbbd1bbc48fc1f20ceac1
font_03_sfnt_off0001412d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412D 10668 bytes
SHA-256: c94ecb692360c9ed92c4d09b755e24747103c514eebb783c915cab580e85a3db

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