Malicious PDF — malware analysis report

Static analysis result for SHA-256 826ebb88ac4f613f…

MALICIOUS

PDF

41.3 KB Created: 2021-09-20 12:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 368013da72a48710ac8fb269a5d2a17b SHA-1: ba238c9e211eda119ab46d570e955333f90dcdd0 SHA-256: 826ebb88ac4f613fa3eeb3b570ed6b50c4504269600f3e5eeb99ee645e7dbd53
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The document structure suggests it's an image-based lure designed to prompt user interaction with a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7348

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 41 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=android+update+download+for+tablet PDF link annotation
    • http://ellev.fr/upload/files/samiwekubudejoti.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133543a9f9c1---vonip.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/14209415714.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/tirufuva.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210903_030706.pdfPDF link annotation
    • http://venkateshservices.com/uploads/31158169581.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/galurusitexaraxupamebuwo.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/d97eb7d3989c213b539533100793331d/dutunebovidizovosowes.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/zutuzemewivufogezoje.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/14638277696145161f988b7.pdfIn PDF document text
    • http://agilesolutions.in/uploads/55078363614.pdfIn PDF document text
    • https://sambelteri.com/contents/files/bozufafumukemegejewo.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/tubimugipobakejal.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/69023062659676284c99a3db8c6dd2e9/80209357196.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/zupifosotugonuxagen.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/5ac6d2377dc073c1f88e6be8542a43ca/jadexedekeru.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/22222831544.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/mamilatisotutofofamuropu.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/12496213023.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/weleluvimuw.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/2704001027.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/50236809501.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/vuvekatisasesupaso.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/mebanuvesagojib.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/31458706094.pdfIn PDF document text

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