Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbb4f12c0757695…

MALICIOUS

PDF

146.3 KB Created: 2021-08-05 05:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3a8dadf418e5a37f10ea88abfa0a7106 SHA-1: 093e1a03be220421b9fdefcbd0fca3940523c48a SHA-256: 4cbb4f12c07576950da27ef7605ddb4565351c39957bc8d948242f8140607b88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating an attempt to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079182898a6a---paniki.pdf In PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/sfaqn66j10l5vqt1krjalo3l23/niwediratopijejut.pdfIn PDF document text
    • http://gdaniec.com/upload/files/6549756678.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608224f13d66b---figesejoderejadigabed.pdfIn PDF document text
    • http://simonide.org/userfiles/file/44896613361.pdfIn PDF document text
    • http://davcpundri.com/css/file/9435538387.pdfIn PDF document text
    • http://smn69.com/clients/866038/File/97152719564.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/kt3nbhk5mq98qp9vr9ilrkq353/20795657082.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/72256271492.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/efa5s30bh2atgt5bu3fr1r8t22/vaxenotupikub.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/vufuvobexabe.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/bd41490cc2a730da7282643e25037691/66467859937.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/befapewofuleziresofit.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a77272a15b5---mugepulolunar.pdfIn PDF document text
    • http://kesifveotesi.com/files/wavabazopaxuxusipumagi.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/wapagowazodopux.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/ff55c1464c20d309ac52201259cb57ca/regomop.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/mokafaz.pdfIn PDF document text
    • https://ebooksweb.net/files/file/pokewutax.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/kupewujolubep.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/14840729757.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/davetikorove.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f2abbe874---nujotumemowivewoximox.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/kerojagubuxoxapomibi.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/nedoxamivalel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+get+kanto+ticket+in+mega+emerald+xyPDF 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_off0001da55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA55 17676 bytes
SHA-256: f872a32efbd9fe2d25d1c0d580148f2fee51ca192c0658c3dffcc0afee938fb2
font_01_sfnt_off0002088b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2088B 10928 bytes
SHA-256: 44ea57cff04780681631ff5ebde4ee9128965415e099b35cd2758bc879cf7a87
font_02_sfnt_off000221ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x221AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1