Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3ab2970fd80c67…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 17:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f73ccf54b4ca200368389e3514ab7fee SHA-1: 9902a10711e11bbdadc9d67b7187ff3a37733166 SHA-256: 4a3ab2970fd80c67f26885394c5547fb5e47afd6e4fadd7c821ee997ec88b9d9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://aquamedia.cn/ckfinder/userfiles/files/jivawabonanuvipopitojosix.pdf In PDF document text
    • http://beveragesgs.com/userfiles/file/24254596066.pdfIn PDF document text
    • http://plncse.hu/php_data/file/piwefewogugudovejunir.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/66013535456.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210827050519.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/zipaf.pdfIn PDF document text
    • http://snft.ro/media/file/96008019544.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5gjle8v2hdneb2ko01kj5gk6h7/72415810626.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/83998513276.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/16703484970.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/1b1692964d5c40f44a25b0b294565328/89477414777.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/71412214920.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/82953998581.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/jufalejolujose.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/14482735604.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/latowipelinakumabixedo.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160984b3f5f6a9---bivonas.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160badb3bb8edf---4380122647.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4aced02fa1ae7206a78d2a9631755cf/ketuwot.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/18831641133.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/84265494056.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/87155564832.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/turumupusosikowoziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=calcium+channel+blockers+davis+pdfPDF 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_off0000d6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EC 17648 bytes
SHA-256: daffa4cb9cdb956970801841939f986cf3510f91eb98cc8f6fd8344fb7e427ee
font_01_sfnt_off0001046b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046B 11216 bytes
SHA-256: 1f2f72c091d50fc53890e4057b7300f916f208ba9a16c9ea59a99202d7585ebc
font_02_sfnt_off00011e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1