Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e812560e5dd9f5…

MALICIOUS

PDF

87.1 KB Created: 2021-09-01 01:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 102721645db1e219014df957d83dfc4d SHA-1: 312b2f750272303c5b2803dfe57c9a933a0a1c45 SHA-256: a2e812560e5dd9f5fcd091c859733a91345c0e2897dc30f704abae26ad28241e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous compromised websites, many of which are hosted on WordPress installations. These links are likely intended to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/35898710958.pdf In PDF document text
    • http://trustarshida.co/cache/fck_files/file/xulolorufuminow.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/r0pcvdc4b1962eucpqh6u7fhfp/34128641865.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160964e1b8c2e8---suverisejaxitifopovo.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f70898a150b---kexarifesinawinup.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078b5fdb65ba---97073554811.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/41308878966.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/e01454a28999a6cc2791de754d032c54/nukitirired.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe41b4d04f---mijinovuminegufoxan.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608237d3bd9c8---bedukofalulineruwi.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/xakomepederaxaz.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/pokuzoxaguvesawovuso.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/julikigob.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730288722c5---33417783890.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/94083993663.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/wedozaromajuf.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/peked.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/mexema.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/vodowok.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6333d0a5bf---tozil.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/71304698690.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/mefabalusubudalikateno.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/negixubudewubavax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=carpal+tunnel+painPDF 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_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 10088 bytes
SHA-256: 27fbd94dee3a23adc0e77c8f94c95bf3b36fa957511dd7fa451a0f138bd7d099
font_01_sfnt_off000106ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 17856 bytes
SHA-256: bda4583f2bb766b7be873d1f0ac5f745f61dc7773cf889bf52584c79f7d096d5
font_02_sfnt_off0001353a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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