Malicious PDF — malware analysis report

Static analysis result for SHA-256 4009c026c8b7e46a…

MALICIOUS

PDF

73.9 KB Created: 2021-09-16 17:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ec9f946bb90bae7474f221ac655b2855 SHA-1: f9b30e9afea56c5bf57d70d5cfb6fe5c5e03ffde SHA-256: 4009c026c8b7e46acf3dc2223aa2433630163f60917a4b55ecc18ff7d4c37c73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=increase+wifi+speed+booster+apk PDF link annotation
    • https://hchoanglong.vn/userfiles/file/fodesisebuvawinej.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/romovenagapawuzevo.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/nurenewefuwezozojetumi.pdfIn PDF document text
    • http://yuli-china.ru/d/files/sawojaxiwupiwupixafumi.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161358f28795ca---45882031468.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/soruxedevupusif.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/lawowuwasokelivopubezale.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/54215f6f5e282ffebdad7d26cd1aa6f3/subebadugixaj.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/35177822058.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/80942926841.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c21b7aa26---87402122584.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/53265772474.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/zerukowidonazowojema.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/rezamuwateforumesewowo.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/70392095492.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/rimutalagamexariluw.pdfIn PDF document text
    • http://toonesk.com/upload/lonidezexumerukekunetipe.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/tozulivekosujevit.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/79655775314.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/fekineniluzulifasates.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/nenaleniv.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/13991994695.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_off0000bb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2C 10836 bytes
SHA-256: 1636446247151d1ac87b5aff3df4600323a94a3463fa0f947439ae0d3cbda15a
font_01_sfnt_off0000d424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD424 17804 bytes
SHA-256: 404b360cd6c42b828bb6db76a240fdfe257ccc3bc4474e104ef17aacffade8c7
font_02_sfnt_off00010249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1