Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3d27242f66f4af…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 21:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e781434fcce09b277cbc1211bb14a5e SHA-1: 898c80cca1df1627443c4045453795d1d8fdb7a7 SHA-256: 7b3d27242f66f4af12444d2bf42ff9a53e7dc9f999decc8a761251fd9d5c2369
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URI links and the overall structure strongly suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5971

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://smidgel.ru/uplcv?utm_term=astm+a53+pdf+free PDF link annotation
    • http://ahxxzx.com/userfiles/202108/file/50890303027.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/rarodegas.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9d28798de415f15a4b5fe15b56554573/bebanorubobijud.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec537a4bab0---49903094421.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/90526714184.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/fusiwufilipifiwi.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/86747606848.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/zivakasupikorixomojapawo.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b279c65a6---94076265525.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/98fa8929150cc7dd98f792acfab2c739/56542378425.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/zejovozibaloburidenukorow.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/miduwiviveg.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/32638427239.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851c638aeae---duriberolasunaduwa.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609014e832932---rokofunepodumeguzikumuf.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/kaweporarozakuwotu.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/inn8ms1dictlgrlop9tj3jhsa6/forinabikebesogaxux.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/liburudufuwitomenevubiwo.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/nipakezujubozapigoweb.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/tetilimu.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/mitanav.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16107150fc5651---wobisobunaturefin.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/16511711474.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/vaxibopejupasulosenovij.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/kavurerinitudo.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_off00010961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10961 21192 bytes
SHA-256: 582efd418565944c6824902a5f81afa30d366e29c2cec9172e5a748c29b02853
font_01_sfnt_off00014147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14147 10584 bytes
SHA-256: e9414354bf89dfb1cdc61937feb6fa98705ecf4cad4899442c8bb5799be6eda1