Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a60088983c9610…

MALICIOUS

PDF

85.9 KB Created: 2021-07-19 11:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: da4c91c659eefabbbff835b6e5191ca2 SHA-1: d50a1883012f44b58882ea1dfc4c349ca1dd18e9 SHA-256: e7a60088983c9610bb32f1d84bd8290430bb9b8598feb34cb553f2695fc90498
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0913682e3---kovuradi.pdf In PDF document text
    • https://fratellifurloni.it/file/donunigebobutewodax.pdfIn PDF document text
    • http://webursitet.org/Files/file/63669854609.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc4130b941---xazujudobanotukipurafatus.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-16/20210716031257793664.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/52251946127.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/73274223425.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/582b746a3c198e7d567012bfee7a1720/73545721320.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a77e61e367b8deb1d02bee8929c13f0b/tagodov.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16083f026590c0---wewalawibubobeletu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e6960384f---vobudemegolutagumumi.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ccsasrc53qjgq1f2unkticufpf/93648561034.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ec176e53---vosutexenagalojuxun.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/jazuveriditefozos.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/tomivomamoke.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e72fc6a0fe58c992a5f0ac7defe067c9/77789678475.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/k0j0354a3medp317e2ksei5lo6/waxudofadiwetavisaba.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ib20f2oifr2ubbtc6sl2qemelv/49815130246.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b41bc887368---tatuw.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/7e2ki9sdsj5sa10m845qpe287l/xuwut.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/54303794294.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e821baa97---terigagopoxakabekefasan.pdfIn PDF document text
    • https://lemanssrl.it/file/bisuxewinaxowefajopag.pdfIn PDF document text
    • http://esistore.de/userfiles/file/50061339979.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/wuvotudigovufelozumeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=reducing+mixed+numbers+to+lowest+termsPDF 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_off0000e955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 18120 bytes
SHA-256: 69ac68e4a2f5d964320c6a1a82d398ec47c305b7f5399b7ca2451070aacbd4eb
font_01_sfnt_off000118a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B7 11024 bytes
SHA-256: e834c6b0af1bae101c31e5979e3556ee9bfc84306925d9e412f923706bd36119