Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e7f7400326bc4a…

MALICIOUS

PDF

88.4 KB Created: 2021-09-13 01:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cfa7e21c66bf185af669c20254dfa8db SHA-1: 2b7047b3a95da21a8328dfd9c507c1bc1e351572 SHA-256: 10e7f7400326bc4a5a7f49c04867a87dd6772e3e2bb1be25c49327db2ea3bc3e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised or disposable domains, suggesting it's designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards a tactic of distributing malicious content through a network of linked pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://ketchas.ru/uplcv?utm_term=a+to+z+horror+movies+download PDF link annotation
    • http://makesomenoise.hu/upload/file/88471997246.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/zoforota.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/31925006308.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d1bc913dc---11911227667.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/84632632628.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/nuluwalegasarunusularusev.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/41228090239.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/pkv176ptkin95aodj73e9o0qo9/betogejajaga.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210911023133.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/zusanunar.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/nusixeboturiravanidu.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/ximojezuripobalumip.pdfIn PDF document text
    • https://qkon.ca/images/file/50469621578.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7bc878e1c0a2b18bb1bbd181ea405ffa/16853031729.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/buzesomebosamurofu.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/sajidepavodogewomafu.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/katuzazijoruj.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/60755722781.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/duvozepabijepotisojir.pdfIn PDF document text
    • https://hinaweb.com/upload/file/52655824667.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/rojumatixejoke.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/dazubumowidabilubudivijel.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/7401765740.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/91812043963.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/zuzeniferomeja.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/66270375303.pdfIn PDF document text
    • 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_off0000f26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A82 10708 bytes
SHA-256: 3af24809172357e7458a13cf90b4fed78bb210c4ecd16695ff3ba5cc15207456
font_02_sfnt_off0001230c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 19040 bytes
SHA-256: fee567f407f6345d1d6ff645a01e39706c2200355f34a1d6b967420ce758a94f

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