Malicious PDF — malware analysis report

Static analysis result for SHA-256 29356db31cae4495…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 21:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cca9631c107fc8d8c86e99bbb95d6a04 SHA-1: d7d2bce4bba0ecc3c13b23902e7aad58e0b51553 SHA-256: 29356db31cae449549c4fb659974e058eee181bbdf3384121dc367e4cc5fc6d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=the+walking+dead+season+10+episode+3+torrent PDF link annotation
    • https://kltccompany.com/ckfinder/userfiles/files/wokidufa.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/xefilefowutexisi.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ced91f344---logusebew.pdfIn PDF document text
    • http://chayka-svg.ru/files/sezakapagafakagopin.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/30184348102.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/44260784892.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/97993618877.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/kimafadeke.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/tobugimexavatekutopakodu.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/kosawidususaw.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614161fbbe985---22587641720.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/zelegotizavobim.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/88852905600.pdfIn PDF document text
    • http://minipit.com/data/files/59172818921.pdfIn PDF document text
    • https://successalpha.team/upload/files/97774609985.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/68492778760.pdfIn PDF document text
    • http://dr-temt.ru/images/file/rodobivewuluxo.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/fomusomedazafisafezawe.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/37229257290.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/bewogox.pdfIn PDF document text
    • http://clingac.es/d/files/70867687017.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/87896109878.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161410cdc1cb1d---60709333343.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_off0000cacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACC 17472 bytes
SHA-256: 24ecd20b9adbf7edcdf0408378b96295728e350b6514183f3e9dd7126612ed23
font_01_sfnt_off0000f8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 11156 bytes
SHA-256: 2ca7acdb46e969d9daf9d75cfd0341a465f0fff3668d83a4eb20cb35c3343b83
font_02_sfnt_off000112cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1