Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6cd34cff1f55b3…

MALICIOUS

PDF

92.7 KB Created: 2021-08-03 08:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: aaf3313f3b7dbdf060cb325bab044d3c SHA-1: af26fdf985b966a9e5d8e23eb47359622a6c54d2 SHA-256: df6cd34cff1f55b3af86f98952dc3a848b3808f762a1d7baa17e8f0ae21b6adb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or other potentially malicious hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or redirect them to further malicious content. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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
  • 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 http://www.siposferenc.hu/html/50931420351.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5def5e1e26---piwikisusirupapadejij.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/f3e2d99741fcbe72296154a8aaba9a8f/51767583329.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/55906358318.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/vovetomamefarivewuretola.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/770707f09bffcb816f1e47a20ea6be44/ladozoxaliri.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/kawuwemegomelujub.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/46650032427.pdfIn PDF document text
    • http://hkalc.com/userfiles/59949543922.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0852ede02---rutimegosa.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/1cc9138e1c4dd12707b4ea247a3a8f02/60954626380.pdfIn PDF document text
    • http://mutitar.com/user_img/files/lulululozebiwoles.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/69745376984.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba063d50f30---37122286165.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/16602440613.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/jaterivowepas.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/9076539256.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba15cf1cde0---69358423407.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870de73d972---tesarifojanuxuzikenit.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608030700ce59---mibexawofitif.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/30099697399.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/cccbc118e7649c89a56a0ea07d6833e9/pibakevipigapebed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=does+boohoo+clothing+run+big+or+smallPDF 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_off0001038d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 10920 bytes
SHA-256: f3d1afac4faea9ad4eca4025fe7a122915c5335d0592494107f1fb2df7fd9298
font_01_sfnt_off00011cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C4 17840 bytes
SHA-256: 49f515db5eda571b1304c3d4083c349c21a8d485cd21e3e9ea2eaa9288751fff

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