Malicious PDF — malware analysis report

Static analysis result for SHA-256 acba898617a8e292…

MALICIOUS

PDF

72.2 KB Created: 2021-09-20 19:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cfbfdba51ecf67c636d54fd447428c13 SHA-1: a86bfe3bd8744adec2c639b212a452d34c8c5619 SHA-256: acba898617a8e2927a49dc6c7eda166d968f548fc27b92458cf7116fb60ebbc7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and a large number of external links, many pointing to compromised websites or disposable hosting. The presence of JavaScript suggests an attempt to execute code, likely to redirect the user to malicious content or download further payloads. The link farm heuristic indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://barefoot.pl/userfiles/file/soxisatulow.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee3a17da6---984743745.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210911160922.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/37469413702.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/72317740677.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/57718832047.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/wikopapowodusojokiwupon.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/0d8596e9812285defd5f34b4fc3df7fe/vapetutidinepaferodagiru.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/magepojer.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/lenivakasof.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/37744198237.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/31837349645.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/nulanebofo.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/sujodulipigedelupidujaj.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/3968815444.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/alv16vfr01l46o28ddmbrg2vu0/2277941558.pdfIn PDF document text
    • http://asja.ua/userfiles/file/50572344903.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/73714028146.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/29157263944.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/sorulufifomolosi.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/52589437910.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16148a62c2fa22---18237822895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=watch+shameless+123moviesPDF 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_off0000ba10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA10 15856 bytes
SHA-256: 3e48fac88c0b52010fd510aee40f101d5d91ee55d6dc90796e55e59ed8ff534a
font_01_sfnt_off0000e279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE279 10692 bytes
SHA-256: 8f694691abd1ab5ff2836d12435aee5ac80b5b1c5200d1c6d50f36b56e1372e9
font_02_sfnt_off0000fb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1