Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bed37582e81121…

MALICIOUS

PDF

71.8 KB Created: 2021-09-30 13:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 64924eaf54da5a87e5ce64baf15b3243 SHA-1: 91070dc0564b6b6c2a6981c796af0654f46a33cf SHA-256: 93bed37582e811215ccb1a41cc01e5a3b42145c1ead5aaf2392e754bb29d965b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Several heuristics indicate the PDF is part of a link farm, with many external URIs pointing to potentially compromised websites or IP addresses, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://obras.ru/sites/default/files/uploads/punewig.pdf In PDF document text
    • https://eclearusa.com/images/file/bipifawaruwuzopunobamuvo.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613021d458cbd---33866213571.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/mebivebas.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/gepukatelikiguk.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/wufefu.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/59497407394.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613904cc7196b---29534903170.pdfIn PDF document text
    • https://primer-spb.ru/files/files/woxagesuva.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/68721880661.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/51826096115.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/16458320652.pdfPDF link annotation
    • http://baltyk.recykling-rejs.pl/imgturysta/files/82755968593.pdfIn PDF document text
    • https://maviet.vn/upload/files/70934623225.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/72387388900.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/zavuxavagarinibexufasukor.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091322560570554.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/zoxoragiresinipuside.pdfIn PDF document text
    • https://energooptima.hu/upload/File/pobigerutamajuwo.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/aj97e20s1kad2ahf2pos7me3na/davob.pdfIn PDF document text
    • http://briztravel.com/upload/files/davitabuwerevikefob.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/83998835776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=genki+ii+workbook+answers+pdfPDF 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_off0000b229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB229 10704 bytes
SHA-256: 30843ebafa1bb1394570ce766e9d9ab2357b0f55133f94642e85f5fa53402ab2
font_01_sfnt_off0000cab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB5 17504 bytes
SHA-256: a80685970d10eb7220c26f79db8f44868b12955905c47939f551d215b75f9702
font_02_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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