Malicious PDF — malware analysis report

Static analysis result for SHA-256 783ea33d5e8d1725…

MALICIOUS

PDF

71.0 KB Created: 2021-10-04 06:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1734012acaa0cfe058ca9561300527a5 SHA-1: 636cabf04c04a5cadd0e4b6bdbaea4da97202b97 SHA-256: 783ea33d5e8d1725c97618c7502950bd702e2c762c5a1ae8ec236e5457878bdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to domains flagged as link farms or potentially compromised. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The document structure and link farm behavior are consistent with attempts to lure users to malicious sites.

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://lolakarimova.uz/ckfinder/userfiles/files/vibewanod.pdf In PDF document text
    • http://pravkniga.ru/files/userfiles/files/gokexurejiralalemiwiz.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210926075030.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/79834642730.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/fowedafutavolodamajovagu.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/rozogujunipu.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/35296456846.pdfIn PDF document text
    • https://hinaweb.com/upload/file/takaw.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/xajidalamizuvobes.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/fupuxadotuzuvapilowubilox.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/35166196247.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a52fc991b4---senitivijazumud.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/wepikapewoxibapefaged.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ec2b836fd---96011992420.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c54166059c---83626824080.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/boxawamonuno.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/90617810637.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/zotupigobitadixi.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/61424130750.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e3cca8cd3d3568eaf789e649660e997b/76226000089.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/37498929012.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/86526645922.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/vitovofomebawuvomopagaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=17th+century+insultsPDF 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_off0000b30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30C 16976 bytes
SHA-256: 4f803c5d6e740e951d5340b26c539f1b346d0eb9cfb7985b83bdf8b472c2999f
font_01_sfnt_off0000df20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 10264 bytes
SHA-256: 170abe86bbbaf4f870a50ecf8b032c8bac50428d548780857c065c264f94253c