Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc0a8420425db06…

MALICIOUS

PDF

68.9 KB Created: 2021-09-06 07:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 037c705218329f83d0cfd939bcb89f38 SHA-1: eb0d0ff69e5696be15ec1d3cc81bb57fb27185b8 SHA-256: 1dc0a8420425db06d33e8ee5f5956ed823b6ec30d222eb18628616bb4f6e0b5a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608727b95dc4c---diperutipokozizuziti.pdf In PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/31150616471.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ijlckdpe23uqg0re0soasmrgn3/magudasemojopodekovosukut.pdfIn PDF document text
    • https://12shio4.com/contents//files/xadoniradu.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/sarexoledejulefesad.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/262j3j4ags9gtufnlt4pi1n7vn/bekikunemaviwakug.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa602c99f---sigoxitudojigigopomuk.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/47255673663.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/2f2ad351df2f2501711e6cd4049ccc97/figigeputidazekuwofo.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/konezatibilawanojer.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/50480812089.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/laselevuporizopimiwupez.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/zikonurepivekekiza.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/n12gutpb6gu46ue8cg79dpi9bj/81299567545.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/23961457740.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dbcad0d1c19---82313673500.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/13a6cpdeh0imgolhbqvefe9t63/lomodakas.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/5929358194.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/dibuvebuvofalonowije.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/daa9a0de934854ebf735d7dfd73d87a5/46768183007.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/14206397841.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/92164469964.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/13013935735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=causes+of+staff+turnover+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_off0000b35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35C 13988 bytes
SHA-256: 3cbd29fa1e10cb51eea7c5052c0404405820d85faf8920579e5ac01377db4d54
font_01_sfnt_off0000d5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 10548 bytes
SHA-256: a2d561f6cf6adc858e5ff9519ab2fa6285466584b09e8bec4fba3f3cab32bbb9
font_02_sfnt_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1