Malicious PDF — malware analysis report

Static analysis result for SHA-256 a000dfaef0f3beb6…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 13:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: afca9ab5f2455e001fbe5e5456b19116 SHA-1: 7d3083d036fa39b42a8bf98a7a8b89f59bdf3d5b SHA-256: a000dfaef0f3beb66fe7502a9347a2d5af90f885e4de1cb193fc43ce7a319566
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure itself appears to be generated by wkhtmltopdf, and while no scripts were explicitly extracted, the presence of external URIs and compromised CMS upload links indicates a malicious intent to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://oniceh.ru/uplcv?utm_term=diabetes+oxidative+stress+and+antioxidants+a+review+pdf PDF link annotation
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d20hocqh6194u3ov2cfj8fila7/1873709652.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073306148e21---nanokivi.pdfIn PDF document text
    • http://siembra.me/uploads/files/92440129374.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///88434630757.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127f33aa12e0---67934666552.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ef4c2d15f---52387009907.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/serujexopepemapawurij.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a0874a04f5b---27400069687.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbecc66eac8---13870476191.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/30107706043.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/durexuba.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/wezewabobuk.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/dudazukaginideriz.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///28499431550.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/rusaratulidu.pdfIn PDF document text
    • http://hanifeugur.com/image/files/66774997896.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/39799282298.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a70a7e6a27---33011463875.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/watomuwapomubo.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/gujesopaxonib.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/61145626020.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/75611696776.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/49072949476.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/cb07eb5a4171e9078a1c6b4eea80c634/rosetobevotuwup.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/bopadetiwadewozixog.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125ae9a84585---76289794789.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/54607821284.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_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 17792 bytes
SHA-256: ab057b6ba1a485e6c4b2ccc6f16d79155f051f33873df50cf69326cff7f445c7
font_01_sfnt_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 10840 bytes
SHA-256: 5c759878ddf60e291ade018df8844529fe2df86abe84a525a80a4e5eb44f4a04
font_02_sfnt_off00012183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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