Malicious PDF — malware analysis report

Static analysis result for SHA-256 926c1d1634c1f902…

MALICIOUS

PDF

80.2 KB Created: 2021-09-23 06:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0885da596b49605bf234a28f8b344707 SHA-1: f54123396e4902b94d4263e17edf60197ff63860 SHA-256: 926c1d1634c1f9029110d6199e84d1db53626b8d12adf0e8c07fd49a76390d05
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score strongly suggest malicious intent, likely phishing or malware distribution. The heuristics point to the document being used to host external links, potentially for initial access via social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=car+simulator+2+download+apk PDF link annotation
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/94721421120.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/migesexuwidibe.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/91644530432.pdfIn PDF document text
    • http://erex.hu/upload/file/93808941269.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/xenolu.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/92548090350.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/bavuf.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/gezinunanadatiso.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/repunudotamufida.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/zozetarukomonigef.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/47785679792.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf3f2c757d---96869955180.pdfIn PDF document text
    • https://signika.pl/Upload/file/lenexubalulufod.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/58050816558.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bd0339a89dca9aff77a1eeaec826e8f7/fafatawokokureluk.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/kevelatebowegisixutul.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/63458760592.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/20357041014.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/zivubilujalikuzed.pdfIn PDF document text
    • http://temdientu.vn/images/ckeditor/files/rorekonukifafirowemotu.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff445be084---72303332124.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/1187138691.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210903151645.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/83532498416.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614390c898f99---tipipajir.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/92942270800.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_off0000d3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 10852 bytes
SHA-256: 3110fd030eae4e92c2994a54745b2ba0a8552e6fe231bb006f98c0dd1cdf1f57
font_02_sfnt_off0001053b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 17860 bytes
SHA-256: db905452ddf18885d72739da1a74f96be768f85a28b853fd0e78c9bd47085e7f