Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae338286360c73e4…

MALICIOUS

PDF

73.4 KB Created: 2021-09-10 15:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 01211a8911fc4f278f85566eb760ea66 SHA-1: d3e155d7802dd302e37df1a08d330dedf4aae672 SHA-256: ae338286360c73e46d1f2e8cb97a4074e014bb10fe4a13812bba0168bc64ef2c
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5901

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://krisoc.ru/uplcv?utm_term=galaxy+note+20+ultra+vs+iphone+11+pro PDF link annotation
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c332a7059068e82ddf7d2013887d239d/pelugulokesuxezogi.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/sebepo.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fb7b877c5---41703477785.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/fanasululavime.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/52943634440.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613058be1815b---baruluzijaramimatewoz.pdfIn PDF document text
    • https://geniodelweb.com/file/vorerik.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/gojojuvaz.pdfIn PDF document text
    • https://insp.biz/img/file/ketopifava.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/niwiziwogeroxameg.pdfIn PDF document text
    • http://micruts.org/userfiles/file/bafixifibebitexowodago.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/37094345564.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca0fd5afd---doruwadebavamazazutuka.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/fopitarojos.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/17908156883.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/27745023664.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/waxurikoduzelenevugarumal.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/89684651285.pdfIn PDF document text
    • http://learningkey.org/userfiles/dopotod.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/73977823512.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/2683419838.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/8747d29fafd8952aefe6f2ce291ec5de/52535757421.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD459 19292 bytes
SHA-256: 877d54ebf7a028eab030f8014e33b832ee7d6691c158e7529d92764fbd21062a
font_01_sfnt_off0001066d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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