Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc5b985384b3b37…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 21:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 794e342aadfbc26a81948174059aad53 SHA-1: dd57ad4e6892dd4e04743f7c95dd164b1d12af49 SHA-256: 8bc5b985384b3b37863d637aa0098d9172f3a073278c691de3b9134b441ca444
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or malware distribution intent. It contains embedded JavaScript and numerous URLs, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further malicious actions, such as exploiting vulnerabilities or downloading additional payloads.

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://cructi.ru/uplcv?utm_term=emu+plains+doctor+lennox PDF link annotation
    • https://getracemirates.com/userfiles/files/tavugufobawotixemugut.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341ad3cd659---kitokifufuj.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/xaranamosi.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/23157889889.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/dd6aca10bc82f347fdaf2b6fcd6a5461/dutixaruvezubuvuva.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/supisumojulimuz.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/49951768370.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/dagatusuxapawa.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/70000691112.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/56231917738.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/57214903017.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/nofupaladaxikumogotisi.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/80187844663.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e011353f19629d268c44399435e677d6/mumujirakivepisi.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/19275414608.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/bajepolikurezaxepoxanim.pdfIn PDF document text
    • https://brakos.it/file/26664490884.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/54695668520.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/tazusotalosutokilij.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134f8f88f2df---pumobejonufosug.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/rofukipofebupatod.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139269803c19---24490636330.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/902bc82225d02525c8fd81e7796c0fb7/pipofowuj.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/34466070266.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/lrq177t281e4hh0lmopouo8ic4/sizuwubip.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/38901534926.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_off0000d4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C3 10860 bytes
SHA-256: 90a8c2614524aff63f5c9d755df17f6bf813675b73163754b2207e941b5c5edd
font_01_sfnt_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 17868 bytes
SHA-256: 6cadb22c6cf750a5af53d4c3300231bc739dd069a44e92f8ba493d620d55e03e

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