Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa448ba661f35f88…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 20:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07b999e825212a8ff4747c2c715ccedd SHA-1: 1f91fe1a831b573f13d364c53847d8fdfd4f3c08 SHA-256: aa448ba661f35f882d25ea8e8c5164659130011423712dc92280f8fb63526809
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://mentaplywood.com/images_upload/files/wizupos.pdf In PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/77282776b334b20310c79d4814bd27b8/43338383741.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210627234456.pdfIn PDF document text
    • http://info56.ru/userfiles/file/puxalarabavusawibemogiwef.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/73654379743.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8c798997---desitimitivijixetik.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/11779246915.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebfa568c5---limetozarekisadimoxunuje.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/ritivinatamefanodupufo.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/52521553624.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072720a18ef8---sulugesojitat.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/bobujog.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/81325265521.pdfIn PDF document text
    • https://susta.vn/userfiles/file/35362856874.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/62536216918.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/9266999422.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/66801233619.pdfIn PDF document text
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/13066801992.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/6748608886.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/3a22ue5bigir5oqilp675bkjlk/ganofizizilafoxik.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/14419669673.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/53829761471.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/bizetakuxatikupepojegag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gsm+module+sim900a+pdfPDF 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_off0000ca3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3A 21480 bytes
SHA-256: c7a2a7cdcc60cbac8c339fb9baeb77cfb24f3d917208e39410c513372572abb8
font_01_sfnt_off000102df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 10788 bytes
SHA-256: 790d7ab18d4186c885a5e86fefcdfd8d37fe18988e9c684290990d81b6ab9162
font_02_sfnt_off00011bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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