Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c61e1fd1ad984c0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 15:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97212a409910ee6a7b1cf66232ef47e8 SHA-1: 3e3a958b6bc5e91936883b657b696f92f742df06 SHA-256: 5c61e1fd1ad984c04bb29cbd9f5a73aaf53cb4e3c3710e41558d1317da7a26ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=false+gods+horus+heresy+pdf PDF link annotation
    • http://jfe.hk/userfiles/zajerowelore.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/baxijojafikujulekek.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202109082282_46322006.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/sutedusuvimuki.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/19504612559.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/73383593957.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/96479196996.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/9959966304.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330e4369ce8---zexagefewolevaxididaxek.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/mageno.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210908114609.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/48273255909.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/185d73d324bc6fa57e4c941760191221/61614771334.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/powigadodidurigosawegod.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/kedasipigeni.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/gejuluwusodadipepu.pdfIn PDF document text
    • https://dintek.eu/uploads/file/mogezikujexogudoges.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/89716293352.pdfIn PDF document text
    • https://parc-hotel.info/file/puvekebimomi.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/97776199647.pdfIn PDF document text
    • http://cocoal.com/uploads/file/nigijo.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/30498026450.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/50068205892.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138e56e50deb---86841231703.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_off0000dbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 10676 bytes
SHA-256: 60ebe123acb10af3cfb3fb6910a48db4d69b74d57007d5874ee90e17583a16e2
font_01_sfnt_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 17340 bytes
SHA-256: a6b8d12242abec17da4b4ccb93f108335c4bc70af7d31d94112d35f51d739e83
font_02_sfnt_off00012064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1