Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b67103c5b82cd0d…

MALICIOUS

PDF

67.8 KB Created: 2021-09-17 02:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fb5e81fa8b72eee78a20d10854bf9aa0 SHA-1: 6e48689b033602c072f80bc237f850378255606d SHA-256: 8b67103c5b82cd0dcccde0d7e456edda1dfdc9b186ab0638cc4c4142f3701391
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9130

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=android+software+download+for+pc+windows+7 PDF link annotation
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16141735476f82---gufomubipovinog.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/27732117591.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/ginadovetiset.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/74425267444.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/nanegupokakifosi.pdfIn PDF document text
    • http://cityfate.com/files/files/72457464672.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/42144317151.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/fisoku.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/40931316412.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109170547284834.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/62270116441.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/gexuzuf.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/98536643537.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613c185a51e40---30546603931.pdfIn PDF document text
    • http://taxfreepoint.com/file/vurini.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/86892120616.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/pitulukijor.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/varulevejawipizemuje.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/pawixajanogogevexo.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/96933369418.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/49229965345.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/68290482079.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c7998a41fed67404c2f0ca8e88fa829a/tuzekisezedi.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a38aa2e675e11d17d16240d32cbfc165/95720958912.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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