Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbfac2b1887bb11…

MALICIOUS

PDF

73.7 KB Created: 2021-07-23 14:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 336a865f7b2a84b19e0c10c3a3ec554e SHA-1: da8ce7734f199f745c7ab3f518d1dd0698a98517 SHA-256: 0bbfac2b1887bb11f7742a888c51b3e3cb77bdd7fad9999b9c8361c8ddf6188f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm with multiple URLs pointing to PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the link farm indicate an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://tikatalog.sk/_files/file/zosatogin.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b0f4ce19d---71650336920.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f533e7de308b0a22e6902824b4cde7c1/lobegaxesolop.pdf
    • http://tlumacz-lipno.pl/pdrzewiecki/files/9069051411.pdf
    • https://hmradiatoriai.lt/images/files/87409332935.pdf
    • https://ladangmimpi.com/contents//files/24344250898.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98f333c07d---kedamaxudibafumufuwenila.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160798220f1e77---vofiwadusitex.pdf
    • http://ahrestygz.com/userfiles/files/20210604_001522.pdf
    • http://nwatchonline.net/userfiles/file/39083376614.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f461e5e090---75214042639.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c93cafec21f94800981b86ce420e8fc8/livezeganizunasevawejoke.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/f57cac549b0948e3e19f23311df80595/2704797778.pdf
    • http://iberia-ex.com/images/blog//file/fukatulege.pdf
    • https://htchninc.com/d/files/86066333554.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160724e811e3db---dupojaguvuv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=havij+apk+full+version
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be8f.bin
a6563bf5bdbd72bf4039a9317dfb40c449c431d8977c283756e3b67718e2e325		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8F 16568 bytes
font_01_sfnt_off0000e9a4.bin
42d90fd14d69421c2419ddecb5df78a814deccb02c742410186858823fe1edd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 10632 bytes
font_02_sfnt_off000101ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101FF 16792 bytes

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