Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d35ad076c32273…

MALICIOUS

PDF

76.9 KB Created: 2021-09-20 19:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c932be24121c937424968e2fbc730e8 SHA-1: cbf1f8c1372c90087a46239dd23171513cbda8d3 SHA-256: 67d35ad076c32273f69482ac941f1f492f3e7152a7064d2a70b1e1211745e99e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on compromised or disposable hosting, directing users to external PDFs and potentially malicious URLs. The presence of multiple external links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pistant.ru/uplcv?utm_term=java+web+start+for+android PDF link annotation
    • http://daithanhnam.com/upload/files/tolunogamatisivono.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210914_FDF839B73A07D95C.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/delivavefenuko.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/wokodasalukasofijiga.pdfIn PDF document text
    • http://wenfengsi.com/wfs/WebFiles/file///2021090706523916.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/pevadudunifagadebomiwod.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/xiganogunabut.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/26582818086.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/77016508362.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/46139470831.pdfIn PDF document text
    • https://haidangpc.com/contents/files/foruzezisisaxevimu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613234f623ab3---59766811398.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hoetnbcoqup18h84b9r6qcror7/31132703590.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tjm0nlpq3lupnjfdq1bojp5v44/41224463930.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0000d6223a116d007ff358e06242cbad/kilixavewet.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/wumuvexunumasusatovinujo.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/37576303774.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/towasagexufuvarabamek.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/gozat.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16142861bb22f7---baduzatesitoxurorukirami.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/690333753.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16140a44de0f06---jitojilugos.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/talujufadaluwotenolis.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/lomugubefekawi.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_off0000c5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 10584 bytes
SHA-256: 6ed4015de407da03eee46b84af4f28f10c5275e9b2c35fd92ac25ede8e32497a
font_02_sfnt_off0000f63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63F 18416 bytes
SHA-256: 5b4219f5a922fa8f2a69eb3d09d796994860a77f7e496b1efe8b229da1fec24f