Malicious PDF — malware analysis report

Static analysis result for SHA-256 591bbf22b660e181…

MALICIOUS

PDF

74.1 KB Created: 2021-07-03 21:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 682a50a9ba56bcf5da1f8a4e9e4449f7 SHA-1: 4c7dd15b83f23c175558ed37973e5184a562b136 SHA-256: 591bbf22b660e181f3e12ce9a0437423590daccd2bbf1ddc789df9b60bc5625c
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 designed to redirect users to malicious or phishing content. The document body was unreadable, but the URL structure and heuristic firings strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/u7hppb85j7usosff33nasn3sqm/86528727392.pdf In PDF document text
    • http://selfmadefilms.nl/userfiles/files/96011297347.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/wivekibetajirokojetizete.pdfIn PDF document text
    • http://charivne.info/images/file/83063406409.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/maxawabogijifujifezoze.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/8254426005.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/84ae380ebd24a767dfc5e746c3833e94/72458245133.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/62b182a350531743fc67d078bec8767b/10561008527.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606de28d08c83---97569800846.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/3b25a7038316dc9593d917c7e83c1f4f/defis.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/0tm195bbidvgcgn0phv4e6ko2v/pebebujazezavup.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/vonotokisukejakituzomilom.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/14720052292.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/cd885dbcf8492b3784dc21e46a088ca0/zomure.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/wubiwibemorigenopuvokat.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/6612204160.pdfIn PDF document text
    • http://unseretochter.ch/images/file/64115625538.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/gimuwasuridopirox.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a8bb61b37---99346674613.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/og1rfoqui25vhmpii4kio3ise7/42754329044.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793707d94ee---59512399494.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/36246244640.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/iqa8os5c6ubh7svvg48jv619c1/75614405817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=for+one+night+songPDF 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_off0000bfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCF 17256 bytes
SHA-256: bd6d0160ae7d9bf6f7aee9e0da9a0ce7e8f62f4744b844768758520d012eafc6
font_01_sfnt_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 10156 bytes
SHA-256: 9f626dca2ba46a11e0613c44cc9d730772a08c608afed01b41ccf9f6ddb432bc

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