Malicious PDF — malware analysis report

Static analysis result for SHA-256 de42e5f0ebcc53d0…

MALICIOUS

PDF

73.6 KB Created: 2021-05-30 07:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d8c0b44701a1c96ec24ad37fc47ed6b SHA-1: 2ddef7a0f5f8ba0b138a3ec6feacf85f1e6eb21c SHA-256: de42e5f0ebcc53d0237fdf1e811ced95c0506c25b7ec9e3edcbff49d1aaef48b
164 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to compromised websites, specifically leveraging WordPress upload vulnerabilities, suggesting it's part of a phishing or malware distribution campaign. The presence of embedded URLs and the 'Download Button' heuristic further support this, indicating an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080076db7c4c---gagovojatujakazowepa.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b19eed84fc---63424911598.pdf
    • http://apsencollege.org/test/fckeditor/file/28610940819.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c7f1e7f84068fd56fe95a4ba33fb4752/lebiv.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/acaa43dd56634f187cad5bc64ce0a2ad/foxagomoza.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/kcu60rpk5go2h3f5c1ds2tj64p/41102556131.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/rq2uq0ac5fpj8msbpu9649d567/vusunafevejoxukagek.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a9cad0ac---42660166827.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3bdd13055b6ce6ec1e0af3352653835/86641445855.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/buwovuwivu.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4b6f149d6---sawuxerur.pdf
    • https://accuratesearch.com/userfiles/file/66789531016.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a6fd6c979---42431624483.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ed9524051---zenesabikijokuwigimepikib.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca34858b62---37777597838.pdf
    • https://alakharia.com/public_html/userfiles/file/71852499469.pdf
    • http://allprintusa.com/admin/images/file/14988628519.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9fff7ef77db99b1111862bb05c796026/70260150785.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=zimsec+a+level+physics+notes+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d9.bin
f842eb8b4cd41fbadf052ade176e81edfeae95cb8fa57d8ffedab909b4c7327a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D9 5204 bytes
font_01_sfnt_off0000e973.bin
3259b92bee9719d378e2583126f0060c87946c62bb3bbef52a985a349718bd7d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 10824 bytes
font_02_sfnt_off00010e0e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 4324 bytes