Malicious PDF — malware analysis report

Static analysis result for SHA-256 f763a8cc1ec076c6…

MALICIOUS

PDF

72.3 KB Created: 2021-10-04 05:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce1798b1b6d1736048934ce8d0db8488 SHA-1: 4ac5ff8257bc22a696de47a777d77a3adb1cff04 SHA-256: f763a8cc1ec076c6fc2e3727581773242aa171e47b6d7bc00a7d2e24f60bb296
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary goal seems to be redirecting users to external sites, potentially for phishing or malware distribution, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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
  • 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://tsradviseurs.nl/mailing/images/photo/file/xifidimedagesawebi.pdf In PDF document text
    • http://lienming-rubber.com/uploads/files/202109100818354069.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109181224056365.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/56483684142.pdfIn PDF document text
    • https://latework.cz/soubory/63072581468.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/90888572508.pdfIn PDF document text
    • http://ashioke.com/images/library/File/52357584607.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/b3j5lfvgj7bcnt1dfsu1q1cj01/40832849633.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2c4b35fb---jilazusoronekap.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vulajad.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/duzuvifofatujamabumip.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/bajinevipimufulikopus.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/70427367045.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/musogawipolekulelofesodob.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/jipek.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/neluxegijiwer.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/66148876469.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614789c623c88---wovifutu.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/vorogo.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/73542538326.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/xokixudibejusigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=difference+between+mtbf+and+mttfPDF 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_off0000b2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D5 10528 bytes
SHA-256: 87958a68b83b9c24d185968cd178f4a9ae63534da187e2b9d259afda3b2f1e04
font_01_sfnt_off0000cae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE0 19120 bytes
SHA-256: fffc4201b7e30f328f0812026ef13f63ca71a36da245bef0c6ea5dcd46dd47e0
font_02_sfnt_off0000fbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1