Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cd95c180b572cf…

MALICIOUS

PDF

96.0 KB Created: 2021-09-06 11:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f94ca7dfacc5138abbf7d98b51960463 SHA-1: e81780e9d7391733b1c666b89976427587b0e0e9 SHA-256: 33cd95c180b572cf5422122188ff70c1ad9134ee6f1d44b673fcb394184065fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ClamAV detection and ML classifier also flag this file as malicious. While no scripts were directly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/feruzisarejapusesupapuzag.pdf In PDF document text
    • http://cupta.org/userfiles/files/20210529110709.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/soxoro.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607364422b8ac---35116040344.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6d4089341---50966690053.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/wufivoxejisibusamemili.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/95912496624.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106c16fc2c04---desotit.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edde7ecd258---58252459108.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/barukamijefaleloganuga.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/kipanizegilawaxunupojo.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/kuludaludefomowuk.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/15667233366.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/fifoge.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/mekadepef.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16115d9755a6bf---94354705577.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7dc22dad29804531c6dccab8a43bba28/16161814358.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/40566869157.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/gamulened.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/bexejalujetusod.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04ca155bc8---fixumus.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wowunuxuv.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3jr7q5ud4ohgankqjvua49akv1/14995794583.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/94335057202.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/fb7113ba5c85c00a212b477106e6b9a5/88644757215.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/vudogu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430081702929386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=kenwood+kmix+hand+mixer+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 19692 bytes
SHA-256: 3818a0504c716200c528f685163d09fa5da6438f7d13feadeac900c1dd5a52e6
font_01_sfnt_off00012672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E89 10616 bytes
SHA-256: aada98b166c8559e7802a6de6f48606de4c61fa427590a776c15a119652565ee
font_03_sfnt_off00015696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15696 17828 bytes
SHA-256: 7254e31a3f13b809cb3861d008f90f30e053303dd5bf4ad7391e303770b3f049