Malicious PDF — malware analysis report

Static analysis result for SHA-256 658e50451932c800…

MALICIOUS

PDF

72.7 KB Created: 2021-09-02 07:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 43b5bc5c4bf5e6138c3e33cdab98b418 SHA-1: 407117e91b84fb01a9ad456a1fb455278a595f5d SHA-256: 658e50451932c800503922bfaa3a19f0b3390804af74579bc71b6bf7ea275df9
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/408dd0b2efe585fa7334fbcc476ad700/1316959270.pdf In PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/62536624006.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/en122qcft58a72c1f9r6s8op80/sokitidapole.pdfIn PDF document text
    • http://sns.hu/_user/file/kekiresixef.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/gojunatedakite.pdfIn PDF document text
    • http://samtekelektrik.com/files/55479348301.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/30933752658.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16117044231238---62304821340.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/modozivozenafezixi.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/87764025369.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c3e721e52---mawoziwu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e7a1a52f77---zutuminovikitizimatodap.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/rilapuwuva.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2b3a360e8---jozogaj.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/wupafiku.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/285660079.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8d003d8507---digobimorisawepunosop.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bd571fad2---94019710621.pdfIn PDF document text
    • http://newshop.jp/archive/file/rojuvelupi.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/wejuxobosuvodibexege.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/v6nvantob62umo15str3tt09a4/51453254137.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/57878253319.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/89249266876.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8299f5c3acffc63fb99d654b7dfc0042/sunawuzopasupezidiro.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b18c5b47b---netux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=video+game+addiction+treatmentPDF 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_off0000bcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 10468 bytes
SHA-256: 84abc90665ebb51711e2ac491f8e1bcf3a29f7db2b11fbf18540bc7d1f2ba06d
font_02_sfnt_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 15836 bytes
SHA-256: 47c03e7ddd994f51336c21a18f52b1d73f28af03ccd4649f11abd5eef7e7088c

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