Malicious PDF — malware analysis report

Static analysis result for SHA-256 50eb6a1727901ae1…

MALICIOUS

PDF

89.5 KB Created: 2021-09-11 12:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6781e7aedcb0fbc3bbff7d85411efb2d SHA-1: 0125be5e719e3f8637865af8aacf21bb77242a3e SHA-256: 50eb6a1727901ae179c3b91dc340326ca4b39c8b8c265d20d283d1002281a208
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pixomot.ru/uplcv?utm_term=dragon+ball+super+english+dub+watch PDF link annotation
    • http://mini-garden.ru/userfiles/file/lelopegatopo.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/dunujegusezonakeb.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/99356499539.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/80246503918.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/vosazuradebefitag.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d2d10d4c3---vawiwaselol.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/25415426422.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/7899190507.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/8c2ba10b9309eefb8427b8469ab1f598/gutipebesudo.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210902134552.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/44618073715.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/nerusanevo.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/46930479092.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad2618922---76636256825.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/dukuzogipuka.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/77491695221.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/demadugopebuxes.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301072dcccb---88079060170.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/givexiwubasirevobidepipam.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/34330517740.pdfIn PDF document text
    • http://technocom.pl/editor/file/40257070820.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/81544898690.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/fdc4fc5fdc89cba4714e660d6b4b3f6f/labanepiru.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_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 17148 bytes
SHA-256: 8e888e3ff7a422200e38d96abb2dbdaaf8f5326201d339765e097c3aa2049b24
font_01_sfnt_off00012709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12709 11120 bytes
SHA-256: e7481df2a36975d39771dd76269e7d78144d5a1037b403a4d8d659230477aea9
font_02_sfnt_off00014091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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