Malicious PDF — malware analysis report

Static analysis result for SHA-256 688e3b69a39a1eaa…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 02:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4ce085c5880e76d9f5a3076f6a72c77f SHA-1: 277e43364f5b8bf20bcb422ccd80e6ccd85885a9 SHA-256: 688e3b69a39a1eaad89450bafea2e7235cca80dacd934db126d2d505b428c2df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=video+editor+apk+download+for+pc PDF link annotation
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aceb0e6626---giwamujunav.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091717144154.pdfIn PDF document text
    • http://recrute.fr/files/files/kaxituvadoxuvowola.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/rerowirawomolipiluvawag.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/19083862955.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/89985030524.pdfIn PDF document text
    • https://123natura.com/stockages/files/vizurulekapakul.pdfIn PDF document text
    • https://alpinashop.bg/files/kizuvetomawelinarekewaxup.pdfIn PDF document text
    • http://bankerz.in/qpic/files/55601033360.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/gekobijadi.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/80665549917.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/b7iakkpmlckhrukoq4hfvkd0kk/87982675133.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/brmilshkpbppakccmv9taqn0j1/sewazomifedobod.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/r78b8ths7426edlopg0ogep26g/xepotewoguratogogeliju.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/gabuzes.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/kerutiginezonujaduduwa.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210927050437.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/biwolukusugiki.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613545f32268f---55517185338.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/65690588162.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/rifedozegogebutuxuli.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/kazilenokij.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/remogupusasagev.pdfIn PDF document text
    • http://toroisg.com/public/images/files/47231145549.pdfIn PDF document text
    • https://afraitn.com/basefile/afra/files/49115454914.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_off0000b358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB358 10592 bytes
SHA-256: 4cb1e0bc9e2bf610e904ae4597e031469c01e974141d2807e939da761e0483f6
font_01_sfnt_off0000cbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAE 15032 bytes
SHA-256: 29677bc39a58637d57a120eb5db24d7ea1fe91e6f2becacddf0e5e1b7c90e7ee
font_02_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.