Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e78367039c0af4…

MALICIOUS

PDF

73.6 KB Created: 2021-06-20 22:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e225a9407f832e2e4fe31d6f3e3869dd SHA-1: b214343a43618bc9b0abc695b6ced7732f73b877 SHA-256: 94e78367039c0af4d4017bb0c1564d069684e2644ea86f59a642d1d3e47687de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081345cf2658---52018991184.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/ht41ip919tt2vfbb9gob9lmgc4/86755863268.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/654d6a98026288c63a28241f9364dd9b/5604054887.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/ts1m8433pupq1ua1r2m5atmee3/48865544595.pdf
    • http://apexibd.com/uploads/fck_uploads/file/legukitipi.pdf
    • http://skrabl.pl/www/rpbd/fck/file/rutavusox.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8d7dd9070---zalimimigejapopuja.pdf
    • https://stallion-international.com/userfiles/file/77217746477.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/0bec3ccc26fbd5fced0fb50959ccd9f1/nofixibatudamoseru.pdf
    • https://kaptenhoki.net/contents//files/rupavumaporenujure.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/63bj0lj55ujb5e9tkg5vg2a7su/64004687865.pdf
    • http://wittlich-luexem.de/userfiles/file/31162993047.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/i0qitgaf84dmcgc1hbgj5gn6on/63290810523.pdf
    • https://brod-plovdiv.com/images/xajeketabebuwi.pdf
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/10141047410.pdf
    • http://cecev.com/stockages/files/jipuwuviroligotegusafa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=batman+arkham+knight+all+skins+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd63.bin
57f52399be470dd16067798214c6ed14decd28437c4f8e14126c3d52e6c5e4dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD63 5444 bytes
font_01_sfnt_off0000efcb.bin
0fdb264d60d5d758b4e25b08da6f530b5adfa2c5f08c0ef1ac27228dd15b2d9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 13940 bytes

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