Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f2df75d37d77af…

MALICIOUS

PDF

89.4 KB Created: 2021-06-25 14:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1283ebba92b36b3d19da01f90ce449a SHA-1: b8053dcd8085d3bed23c6ead980118e3810389f6 SHA-256: f8f2df75d37d77afd407f9cec2f65ce38fbf60cd82f7f1f2a361169bb4f3eee6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including a ML classifier flagging it as malicious and ClamAV detecting it as a phishing trojan. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic strongly suggests the document instructs users to copy and paste commands into a shell, likely to download and execute a second-stage payload. The numerous embedded URLs pointing to compromised WordPress sites and other domains further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=cucm+12.5+bootable+iso+download
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608959ea4cdd1---pomaradum.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/aqdako5p1iii1s2dh5erikjb91/kujofi.pdf
    • http://chronicles.ae/userfiles/files/71346368186.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a70eca733---kekewobu.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b519a294c7a---90913179380.pdf
    • http://hotelgiottotorino.com/userfiles/files/zufurawitibuxidoz.pdf
    • http://ledseoul.com/userData/board/file/pesigefinira.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/929a2d8b3089e5e9543af349b628e058/xupifazamagutedobunu.pdf
    • http://raczcsalad.hu/files/sumigiv.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/4bd3576c2f028f8ac83f436c0b81ab75/gutezatumovupadojozo.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7754aca322---18207435109.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/79012fb4049eecd9019e2eadf1a1ffeb/65113716504.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbf951669b---bufaxasetizezomelu.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/539754fb13226edc9be7e33e8ab0e3d8/sapelimixupibex.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743062bb953---53295803363.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://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b5.bin
e14982689d2cad1b6c3f1db6bb8e2c26d3efba95e748f9e145830631d8261ea7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 11160 bytes
font_01_sfnt_off0000fafc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 16792 bytes
font_02_sfnt_off0001130d.bin
6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 16068 bytes
font_03_sfnt_off00012829.bin
da9a53a6a22eb443caa78cbf91d880440f84143729ce4833384123d4d8530b11
pdf-font-stream PDF embedded font (sfnt) at offset 0x12829 18392 bytes