Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d5d7c6ed3aedf4…

MALICIOUS

PDF

74.9 KB Created: 2021-09-07 17:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e3d0ba3dea7a01db2f8a8c37f831aede SHA-1: 63de00ce45a3d6915090fcabe7527b871097b99c SHA-256: a0d5d7c6ed3aedf427c21d9244a9dee80a9c2459968be1875d6190244ab82f2b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious files. ClamAV detected this as a phishing trojan, and ML classifiers also flagged it as malicious. The sample's structure and URL patterns suggest it is part of a phishing campaign aiming to lure users to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5596

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://designerhouse.ru/upload/files/garirikapozakisi.pdf In PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c11890d4f7---punotixifisofogemilo.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/vudojasozalalonajedumi.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/61955749991.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/meponixonege.pdfIn PDF document text
    • http://drtamerturan.com/file/4807049187.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/de622337e5f683e7315b7b2f77495e1a/soxarurawalu.pdfIn PDF document text
    • https://bselink.com/userfiles/file/jemifenujop.pdfIn PDF document text
    • https://ancoraeducacion.com/images/nirika.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6558e20fea---rerax.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/bavusesen.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1f933430c---55199966282.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc3ec1bd6c---suvud.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/61241514674.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/41702858528.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///watuxelukagisuxi.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/06690b45f3e315a41f9e7f014d13aaba/senizitekigujigerozafuso.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca67bd1d28---pazeguve.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/mpq4rn16an466l00n4ul1ao90a/bumulolonazelimudofi.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99590756123.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b22d30938---6283777411.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/2815122556.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/35856573716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=abakan+2288+pdfPDF link annotation
    • 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_off0000ca8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A0 16956 bytes
SHA-256: 962d3a69dfb32b6136f9d9812f12c98d1137e5ea8b70fd5a1b6df91d56bcd4d9
font_02_sfnt_off00010ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF9 10276 bytes
SHA-256: 2038702c975a75c0a1a890aa3fbe7379a727263416b1fdd85cd880f853e3cc24