Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e71de7a7e43a2d…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 01:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a4254fa4f865bb77bbed7b170a9081d SHA-1: 80f47407a465285382c97d63751a3441de160208 SHA-256: f0e71de7a7e43a2ddf040f90545bf4915fe51e8dc074f69c7cc43c465e873029
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, indicating it likely exploits PDF vulnerabilities. It contains a link farm pointing to multiple domains, including compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5455

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://garglob.ru/uplcv?utm_term=what+is+the+function+of+otg+in+mobile PDF link annotation
    • https://www.amata.org.uk/ckfinder/userfiles/files/pisapifopodimalegadotusuw.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/xamexitejasobisigevufiwi.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/1456111348.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/zipigodixijojuramopoguja.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/mubobotapixafenezasutufi.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/41233635610.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffcda464d9---97750860907.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138a1f16b226---xetufurelulenas.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/piraxaje.pdfIn PDF document text
    • https://shidoremicrosys.com/media/13950177164.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/60616992338.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/fefalegolawimukosez.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ao8al0ekeu1da2fbr4j02pjo07/88712888890.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/wizisadanemebedobig.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/83239658629.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/vafujavosademesidorenobot.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/zesosikavifulurerabuv.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161479b0f5c64a---54561868544.pdfIn PDF document text
    • http://malifer.hu/upload/file/misisesiwuwojuzawagaxir.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109012258206890.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/powoxegorasujapirow.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/sizedilu.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_off0000c5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AA 10916 bytes
SHA-256: 3083af698a1f0b29e666adb4e547ac7894d1f0a980fd187badc1b004f156e55a
font_01_sfnt_off0000dec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC7 20436 bytes
SHA-256: b37a03ec8279a785b71c9a8012d3f33c1da6c73ba54d768334ab22ee852285b1

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