Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a24666039b09f91…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 15:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f05aff1956a401ed1513d2466d6fbe5 SHA-1: 278f88552fddb53a2813a3078af0b56180095154 SHA-256: 9a24666039b09f91749db22ac5d6577a1be5f0df0f64339ffd58726376fc31a3
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 on disposable hosting, with multiple URLs pointing to compromised CMS upload storage. The embedded URLs and link farm structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://smidgel.ru/uplcv?utm_term=cheat+nba+live PDF link annotation
    • https://grootformaatspandoeken.nl/userfiles/file/3593440557.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/fadewodula.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/tobevazokarer.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161346fa22f289---sigufubizuwefu.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/74891377749.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/38901735627.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/roviv.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/60443136153.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/puletenokevosefez.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_08_10_31_57_9722.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/32478134323.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/82521265386.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/194533981361335dad6e64f.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/gamaziwo.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/kebuzom.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161379bfae6aa5---56444932002.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/xineg.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132c65f52936---navizexolerekirorukobux.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/77862306669.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/78003441100.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccbe594004---kagumuretazumekaboje.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/pifolapivawutupebesas.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/sesuzupox.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613175cecc535---lavale.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161387499c894d---welidoson.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/76c9c9ab2f358161ce87cb446ac5dee9/domukofevefuvinitovogif.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_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 10056 bytes
SHA-256: ba55ab2187a56e1b42f5c58827ec2d8ce0224c2c77caec521269ec94120bec9a
font_01_sfnt_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 21148 bytes
SHA-256: 9bf05246e60c2dde3db960e8460577a68863328e954916e11fcf517c757e79d3
font_02_sfnt_off00012329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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