Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8d2a83fd08f9cd…

MALICIOUS

PDF

69.7 KB Created: 2021-09-06 19:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: baa4229d78550222a5fd522751d32223 SHA-1: 2b83f7b0051f2a795ee5a4b2f87e14b6b2ececa8 SHA-256: 8a8d2a83fd08f9cdac2ea7a826fbe95aa451037adb57a7331ff95b76d4bd6631
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and appears to be an image-based lure, typical for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://huntic.ru/uplcv?utm_term=rudrashtadhyayi+sanskrit+book+pdf PDF link annotation
    • https://e-tta.com/app/webroot/userfiles/files/85624197651.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/91507153991.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd138bd75a8---85408353233.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610ce507a24b7---6375613618.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/28648164366.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/wevotojavudekima.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/paxobapadiziwosi.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/4b855f496789cf1f8e7f9cb167921e61/ganoreligagevoxij.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16126d1765ba60---zevinigeneb.pdfIn PDF document text
    • https://wildnaturetravel.com/File/64870265622.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/37417145932.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50808bdf53---suxiruzezewano.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/51823746096.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/e7b5c4ca9bad6ef3e6c1300614d3f6c8/8162517426.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/a242db20e86797c956afc459ca27ee48/67650358621.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/xofupokozotadadibaferul.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/nitedoverijeroz.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8b6606ce9---vubof.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8fd5b92f8---37552591923.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/71105885375.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7a3693a189---20147483041.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/jisilaxufeposi.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/tuxumogolutuzizi.pdfIn PDF document text
    • 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_off0000b30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30F 14264 bytes
SHA-256: b9bddaf6eb5a8fc97d823c32c3e660b35741f21ff8e1ed3106f63261fee78bea
font_01_sfnt_off0000d63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 10908 bytes
SHA-256: 7274c514a6b8c205709764faa9047e0773a27290ad79f7641e46f3e8dbe303b5

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