Malicious PDF — malware analysis report

Static analysis result for SHA-256 583f649fd7b92a89…

MALICIOUS

PDF

76.3 KB Created: 2021-09-20 14:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3d284a7f09c4d675c97c01cd9db2b895 SHA-1: f597a55c56d7de7de1c46ff574fdc9715da7577e SHA-256: 583f649fd7b92a8990a2e0e511085192e673b24112ee3473082dbab2ad878e06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or scam campaign. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=du+recorder+apk+no+watermark PDF link annotation
    • http://www.css-jp.com/upfile/files/2021/09/18/jirezitasugogobirodizeg.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/941bda4583d4d927f06fcb0cf87ec92c/92327673147.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/8651657512.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/nituwi.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/74703311721.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/15969446686.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/35138652501.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7fed653c284fd32d57ccfd1d8db1d6d2/sodomamijeduriso.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/gavuzap.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/xemitojisugedikokazejo.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/71283912934.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/54213837196.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/sojivuzokusirita.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/56070148767.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/61411083081.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/liwadozuxetavepepiweku.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/91150408145.pdfIn PDF document text
    • https://kimcert.net/E/file/nemofopek.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/zevixodezatugaki.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/kanom.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/batoporan.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4d8e0082fe0e5e629ea83b0cfe3e8043/75083390988.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109040226557662.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/b9addcaea69bae8a2242e4a11cc15a17/21109137110.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/fesojemuxerubewigupobo.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_off0000c7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B4 10648 bytes
SHA-256: 70e90ed1306106374c778db574346492cf403a10333fa4aeb1b46edb86c03485
font_01_sfnt_off0000e027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 16732 bytes
SHA-256: afaf2caf7b26c6bebd30fbfa8046b242e14fa4542d3daefe523329c51b53545d

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