Malicious PDF — malware analysis report

Static analysis result for SHA-256 c129e43c23fee366…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 23:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c0c9dce23d161f3248f648ee63aad989 SHA-1: cc87f488a41f4bf00cd006ca2e1e40684857eaf8 SHA-256: c129e43c23fee366908d9b2a39d7fc71a2c9209b195ef0a15484a1f74930667d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=rules+in+badminton+pdf PDF link annotation
    • http://graficaeformazione.it/userfiles/file/81164954084.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210626052724.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/14303105472.pdfIn PDF document text
    • https://gilbertems.com/videos/file/kavabadalukupurolumu.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/xatapadokomobolu.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/jowarisirolukag.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/4597700989.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/meputabosifogawuxe.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/2523962128.pdfIn PDF document text
    • http://zjlytl.com/images/upload/File/dezemapitefaderozed.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/16880249526.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/zukokapabaxapolevu.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/42484130159.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/fapusuzazejejeb.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094a48f7b377---18609972281.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/31387164180.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa81c16d6a---veroxepiwomefulimuzivevo.pdfIn PDF document text
    • http://usagimatur.com/files/others/vakifomisivilodumi.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/57769502818.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/vn5aofvn61j4bi0k1bq26mebk4/47892315835.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/suzadujedufit.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/wokubaw.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/26828569230.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/lovaxelanoxiwegomogobasi.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_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 10844 bytes
SHA-256: 4872b86858bb3772eb12de5dd13625c32b4cd5c9967abd425b994787046ed5c5
font_01_sfnt_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 17784 bytes
SHA-256: 2b8047f63c285f7647e538744dc2235ab5522bf1a644f64801030e797cd7acbb
font_02_sfnt_off00011db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1