Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90dda8c45e0d96f…

MALICIOUS

PDF

93.9 KB Created: 2021-07-31 01:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 518ff18e884139f76b9f4773570fe5c9 SHA-1: 7b89042e4640f553b1d82cf103b067f1b34850ae SHA-256: b90dda8c45e0d96f35c12bf447ab9fc45f83dd7b5696b3ca58e2f06a43a65554
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing campaign. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=word+cookies+answer+cheat+sheet PDF link annotation
    • http://wintec-samu.hu/uploads/files/13427162575.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/23583427799.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202172832874645.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/depoxojowifawirabekuserik.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/m3aj41d01uvvip6etmo2mmh14u/44981808429.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0f8c73107---nedutafupakefolon.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160870c30235a9---27555879455.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/anhueeln73i25auini953o0v92/84778815525.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/77439951764.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/23804975879.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080b4110f7fa---nemiwovumebedaw.pdfIn PDF document text
    • https://termoformat.md/img/files/runopalolotaz.pdfIn PDF document text
    • https://fivetc.net/uploads/files/70386993472.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/6ed131136271317c7ecc378115d28acd/37531942198.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/34082aff3119d6dc4c5964a2b310cd09/lezupaxix.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/raroginutomumojajijet.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607743c511abe---69534926859.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c1b1db11d---72749741185.pdfIn PDF document text
    • http://brlairport.com/images/file/58159951111.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86b198710b---paletuvalumipepulojit.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092027796f8f---nozeguripeveluribipet.pdfIn PDF document text
    • http://jngf.cn/files/file/gefewonasafisavodovalidu.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/ruvogovosofaxaroginoza.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/0617c7dbdcecce3950e1ea6e33994478/kafedupabuxodifogope.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_off00010ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12810 16204 bytes
SHA-256: a87d5b4f45f9a31e937061529badc86976ed7b5cd1aa62598b29a8ea5f2278cb
font_02_sfnt_off000151a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A5 10592 bytes
SHA-256: bbf03fd5003f87f9f933f84298358b5ebbc9b1d994b92e8758288aeaa7389810

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