Malicious PDF — malware analysis report

Static analysis result for SHA-256 186d0e971bea8d87…

MALICIOUS

PDF

88.5 KB Created: 2021-06-27 16:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a32493a33120dc53621aab52426a82e6 SHA-1: cc4c44aad4fed869efe49214c4d30bf2170b0c56 SHA-256: 186d0e971bea8d876d0d1b373fc22a942f5f0e897c733a2e73e3f0d756437ba5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains an embedded JavaScript stream and numerous links pointing to compromised WordPress upload storage and other disposable hosting, likely to redirect users to malicious content. The primary attack vector is likely spearphishing attachment, with the embedded JavaScript facilitating the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://prunay-en-yvelines.fr/ckfinder/userfiles/files/selejadokofiwa.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099754326b9e---46171840569.pdf
    • http://artecgroupservices.com/imagenes/file/sububotoxuwodimijul.pdf
    • http://elitakhealing.com/ckfinder/userfiles/files/5652987047.pdf
    • http://bezagsecurity.cz/userfiles/53151498858.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf42e286b3---kotamaka.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/7f0317ebd01cff5dc680912b597df244/5797519469.pdf
    • http://sakem.org/userfiles/files/nekimimoji.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/fatusorejuveka.pdf
    • https://fcr-fomentoconsumoerenda.com/uploads/files/66423728669.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/39723301942.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1c735c8d3---43923175967.pdf
    • https://pezenasenchantee.fr/userfiles/file/48289376810.pdf
    • http://zrdb-drogbud.pl/Upload/file/kitovopatezujawegokimates.pdf
    • http://arniestribu.com/campannas/file/68878038331.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078904bd109d---14207922406.pdf
    • http://anthonyvienna.com/sites/default/files/file/fezutorivapijuj.pdf
    • http://blow-w124.com/js/upload/files/fepakitiwete.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607610eb002c8---44136093096.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff3c18424f---72493708705.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fc01b9256---fopanefuxemewotumuv.pdf
    • http://zrdb-drogbud.pl/Upload/file/zenelajugikulawurili.pdf
    • http://unseretochter.com/images/file/xolebaxorizepiruj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=face+swelling+allergy
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 16792 bytes
font_01_sfnt_off00010fb6.bin
1742f07dc41d60314b2286522d947dd6e03cf7b1780e9fd6bf237028e874f650
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 17580 bytes
font_02_sfnt_off00013d6d.bin
0bea2c33ad9f05dba57d3a9811be4c3f6621a40fef78a254a8881ab4c244c44a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6D 10364 bytes