Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb26421b3192abb…

MALICIOUS

PDF

105.4 KB Created: 2021-09-06 04:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 95bc89449749e6d63febaae41266e15a SHA-1: b048b61c652e54a9e9d2e0c5045885adf38bc917 SHA-256: 7bb26421b3192abbc9b9f6dab3112fac552ecb1e0e8a9f04cbba5ac961709f81
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF used to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2668

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://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/6euihi8qiic8o1tq3j2cdg00at/kotikajobalafenut.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160982d821ea31---bitup.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/23349207775.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b6cb93060---bajopawogukegek.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/24782372035.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608764bb67d73---13704785819.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/sisebepifefikasodezik.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/benukeben.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/54780706014.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/21707417413.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/f53199f73d3332ad6296f0105efe1d2b/49787679627.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e7165d4ec---guwegorosotigigusuxipibow.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f25a853e57---rubopabukuxuzulaxi.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d742325430a---59468037409.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609484c5629c4---jimate.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8b98f309012471c32e8d4c119f02a9c4/nogilikivedakozetovudirud.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/pirubawijakavawajatuxajoz.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/zudiwaxobimejusetiwub.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ug8h2n8j8ed0d0kvikat91mhkn/49215148250.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f407e803df---xuzoko.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/84567240069.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/70859877832.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607041e039000---belitanenetejuwivi.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/97106545205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=apostila+pintura+industrial+pdfPDF link annotation
    • 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_off00013b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B49 20632 bytes
SHA-256: d426f02f8a11292a032957f976e5e7b6612974df3b55eab1bb71fa425352a1a7
font_01_sfnt_off000170ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170BA 10440 bytes
SHA-256: d5f95fa2bd369a8afe49d82ac7810ccb192c39b647f054de8bf4a21b068063c8
font_02_sfnt_off00018882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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