Malicious PDF — malware analysis report

Static analysis result for SHA-256 88865e976eced198…

MALICIOUS

PDF

84.1 KB Created: 2021-09-11 07:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31c78933c28ff1e21be8fa56edb25241 SHA-1: 4eac8de3c2dd0af0304f8c5835c9ee71abed66ee SHA-256: 88865e976eced198a3ad34673091c8828f4a39e00236831accc2541fbd5232be
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external links and the nature of the hosting suggest this file is part of a campaign to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=screen+share+menu+in+android
    • http://enslev-anlaegsservice.dk/userfiles/file/98513711742.pdf
    • http://resortcrimea.com/ckfinder/userfiles/files/tuxarofemogeledorenevaxod.pdf
    • http://linpus.com/app/webroot/userfiles/files/nipeni.pdf
    • http://satthachkhe.vn/image/file/kifinasiduni.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/568a7d1c417245efa4184bee24d5efd7/fowokibekafaxizeduvufoso.pdf
    • http://celeb.huh.hu/UserFiles/File/derapumes.pdf
    • http://drairtools.com/ckfinder/userfiles/files/33532764499.pdf
    • https://lotusmarinevn.com/upload/files/64776089314.pdf
    • https://tourpon.kr/FileData/ckfinder/files/20210903_43B46BE89CB71549.pdf
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/81903937587.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b17a912606---82140197205.pdf
    • http://colafranceschi.it/userfiles/files/55670652405.pdf
    • http://fresh-j.info/images/uploadedimages/file/86898010618.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16135924d496bc---11493788472.pdf
    • https://santchavarabed.in/ckfinder/userfiles/files/ramezuvubine.pdf
    • https://groupunsur1.com/contents/files/lukupegazafipobo.pdf
    • https://eownauto.com/uploadpic/files/gemegutisifawadifif.pdf
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210902_E12892CF6777F388.pdf
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/remosaseku.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/77787169593.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/88904535866.pdf
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69972290951.pdf
    • http://enslev-anlaegsservice.dk/userfiles/file/pizidavajakalixupami.pdf
    • https://magicdiscoradio.com/userfiles/file/19416824377.pdf
    • http://menifee.hanasushichoice.com/uploads/files/daxaposex.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35d.bin
f25fd39d4d03d1e5146c33cefcb7462b2038c0f3e16e25b88962d9c83650f035
pdf-font-stream PDF embedded font (sfnt) at offset 0xE35D 10664 bytes
font_01_sfnt_off0000fb7f.bin
0a9b5de3c693f89329bf7ef28d0b5dc153df9756eb10c7327514be1a0e7b22d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7F 18168 bytes
font_02_sfnt_off00012ab8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB8 16792 bytes