Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1d4ff16e015121…

MALICIOUS

PDF

78.4 KB Created: 2021-09-07 00:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e6382c0c9420b5532c121e5e12767325 SHA-1: 7624e9f6e44f098a17ef144d74bb16b0aea91b4d SHA-256: bc1d4ff16e015121d55a9220551be0cc405e1d7e3c538ba560a054cf145c861a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggests this PDF is designed to host or redirect to malicious content. The primary attack pattern involves using a link farm to obscure the ultimate destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=chemistry+matters+textbook+answers+pdf PDF link annotation
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/61f9cc644bf901d24e2822b48678cd32/mudozu.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/tofam.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/sipivuguzew.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/lorolabasus.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b15da7b4e9e---gesetitireperogitojaguseg.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/83017516473.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/jipameligovexut.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1611ded9132b2d---33690522082.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/8109558572.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/wimimusujidejejutijoz.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/20681639515.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/70366770554.pdfIn PDF document text
    • https://ikansambel.com/contents//files/78530251966.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160850e13cabb4---12596844173.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/920f6a175ab41283c65bcdf34c762982/xijeretosaranixakoboko.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/53412486101.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/werex.pdfIn PDF document text
    • http://riceart.ir/basefile/files/gutejebobipiwijoxusa.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f87160b6631---nurijonaxavosopikukusaju.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/3d509fe3caa3efe177ff8e907fabc89b/dixalotopobemadalizutu.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/xevarax.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ea8ce27f2a83e8c9b44794eaa706ad5/gajoredivasunegijuvi.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/lodufozitororo.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/26011698320.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/59435287616.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/futibasusovumexubofalit.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_off0000cd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7A 11280 bytes
SHA-256: eaee4f1f907fcbadffd1a1e0f47c1ac60ea3f7d606e22f6c481974399d66399c
font_01_sfnt_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 17064 bytes
SHA-256: bcba091c510fa5001d2ecd629ba0e3d9aa7aeef24aab02124c0509f87bab53b7

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