Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd43fee76b02d4d…

MALICIOUS

PDF

103.2 KB Created: 2021-09-03 20:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3eb8ba72d778a1b732df5b1684b13cf1 SHA-1: dd99d465fc97432ef52b1e08e768c15d9b47108e SHA-256: 0bd43fee76b02d4da425e741c299d5d4969a8760f7de5d46ed2b9eafe7e3dc15
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns point towards a common tactic of using documents to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://cutskytools.com/d/files/42428213738.pdf In PDF document text
    • http://cpgny.com/userfiles/files/70025329042.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/b5req2j9mqlrjimeigtev4nohd/51790262817.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/rukizimipavitumabegizud.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/pixew.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/18650697519.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/47181082092.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/veveropa.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/76863836304.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8df97bff0---gilepes.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7676986aa4---vexulimek.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/92027930689.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a21bf085c3d---78396327237.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/xopukimaxugodeziwesuj.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/94260936237.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/2910142115.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/6eb7ac992c7eab80a1526bf941cd53e2/katakatojenutigovefub.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16113732e350ea---62031043617.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/s4uclb162gg1n27o0omccv1e34/xiwajabadosawolij.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/rizazaxekufosegak.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf292078f1b---kowomi.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/wepemesefirebag.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/dugepumolubikezonafamej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=nonstandard+measurement+worksheetsPDF 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_off00012e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001462e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462E 18900 bytes
SHA-256: 004cb8a1011c15c14febccd74eb176f36cde0414c78d45f39664500c97e8f613
font_02_sfnt_off000176e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176E2 10632 bytes
SHA-256: 8f0f4939a119cedbf400b19598ce9387799e362a36f4d039e436da1b3c0cd63c

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