Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22a526bc2193259…

MALICIOUS

PDF

87.8 KB Created: 2021-08-01 03:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c39c375bf66dfb10da15e4124506912 SHA-1: ec1f335c91799c775852d3e7464ce425feb99df0 SHA-256: c22a526bc2193259a8027deb20c40f492d4d17b508d0d561ff5e45f4b775c72e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The presence of a 'download button' lure and a callback lure suggests a social engineering attempt to trick the user. Multiple URLs point to compromised CMS upload directories, likely hosting the malicious PDF payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/35d61bfc79642db5c57acfd4b243465b/lozanodepevuterepozukul.pdf In PDF document text
    • https://dondepodemosir.com/userfiles/file/51988774531.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160848ea328580---33654454244.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/pukiguneforibog.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/nigepawavanepufinigixoxur.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/25731717848.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/dfac4c5b0705a98ecf1a69a988f23824/20261634002.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/roxonewudopox.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ea4b9htqv8v1bgfp6pme7p35ib/55460274268.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/xepefataterudijadogalozub.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/selotukonerebejaleri.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1878267515---fomazumes.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/fepomo.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/33e5a9c1c447a6f3a38ab48353c8712f/ripabifigoxiworusu.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/58dc5ee82c40a9a8c30e07eb074ab3fb/vukunivozudagex.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/deviwasuperuwox.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/bifezexowubivogi.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/tdrtsq8crdvut39mjfrki8ua57/jonozuguv.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/968773d28ae4ed7ab74523400c934fa0/75476431239.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/43569501028.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/a9899c7e8295546333c08654b4f02835/povewomifejumijeku.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/xidemuser.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/m7gs6a76tduasjrdoj022f3apa/dolipoxavarezadelogisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=significance+of+bilva+patra+in+teluguPDF 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_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 10868 bytes
SHA-256: 81d9deedf130796041d4a4b6b7622095834e677a54a010c23a03f3f1d1503a0e
font_01_sfnt_off0001090b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001211d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211D 17380 bytes
SHA-256: 9b80794ea3ca85f724f62bcc4ec03d43f7fb9c25dc7cc8ab1dc46e6dd2dfc4ab