Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f7ca4568253395…

MALICIOUS

PDF

85.9 KB Created: 2021-07-31 03:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 60b0952700dc9b26cbf0536ddc6905de SHA-1: e4e37a134502495fb1423739120e401d8cefdadb SHA-256: e1f7ca456825339514836d584b09a963db008fff91ec700b38c4f503cd2bd1e9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of multiple links on potentially compromised infrastructure indicates a deliberate effort to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7137

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://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609da3ade7fa4---savodaduxominu.pdf In PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072822a50fe5---90356875208.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b085330bd93---gatagaxiledugaxerizole.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/zufinokizupaxinutopakif.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/taxiv.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/ad4088bf2999320defb1630658edcfe6/92088542397.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/78281628033.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/notizitexolubokawokilufi.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3833c3057---56482233171.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/76917105380.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eff0b4afc---simenanoxufisuzowojulewus.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/dofob.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/icq1cg7o6ufhfoiefsf8nol8s8/9719883379.pdfIn PDF document text
    • https://atrax.hr/files/62111651323.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abbec1ea6a0---14214183783.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d231e5a1136---tejopu.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/777bb39aca1d5d67894cfcd0bf83752a/8755370833.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c6b267b3---22055820518.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160e568f03ddcb---xikuwenutajajudojezo.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/89159811203.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7cb5ae55c2d49b62669be0688f62aa80/15542436010.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/2b1ad3d970642910c3d7ca7e7c5fbc85/febutejera.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087eadc183a6---nenuxodugopil.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c93afe99429---mozububavutimatodivugav.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e24131b52a7---bukuwutikivobonas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+write+a+policy+memo+formatPDF link annotation
    • 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_off00011305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B17 17784 bytes
SHA-256: 1f7544da3a1d6d399cf219659eea3e03f00c6a4fe2bb3c47ffbd73af78e9f624