Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2146b61bc39b84…

MALICIOUS

PDF

77.5 KB Created: 2021-10-24 13:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f645d93a581715ec72997d563a64bad1 SHA-1: 79862d842a0559965cf20694391cebb3ef026763 SHA-256: dc2146b61bc39b84ac3a0b86adb33c1f08ab861e4545597ff5b294a84cf688d4
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that redirects to multiple external websites, some hosted on compromised CMS platforms and disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm structure suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://kuppersbusch.hu/userfiles/files/povasevizani.pdf In PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/84564948316.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/2ce0f8c509a9fd673a63312a230abd15/93119981836.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/wonidomodovemifaromopukat.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/683e1e3097995cecce27a81a6d79ff8e/3823863981.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/tukixagexa.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/62543830474.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/67283951677.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/54156796588.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/61675814909.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/selolulujukekudipumezol.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161538810f1e63---63369957820.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161589e66f1785---wisedexisulomuwabi.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/puvum.pdfIn PDF document text
    • https://miet.hu/kepek/berifusogujefaposaf.pdfIn PDF document text
    • http://momsystem.ru/public/file/85918605809.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/99469407570.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/torisukidukom.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/zukigewil.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/jiwijegile.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/badizilujokebivubewuguxa.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/vozujotesiw.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/896FEnmJZlk/uplcv?utm_term=how+to+draw+beef+bossPDF 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_off0000cccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCF 10320 bytes
SHA-256: 6483b8bf37740b3c3cb9182e0d1afdff31c873507a95308b2e0a88c89d6d1966
font_01_sfnt_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 17084 bytes
SHA-256: 0979f5d118c9dd34d7114884966f117064ce426a58d05bdb9aaf499c173812dc