Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8e9b6d6e0fe231…

MALICIOUS

PDF

69.4 KB Created: 2021-09-17 20:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59caa47d5190cde1e57750aa6e8dd7c8 SHA-1: 2eaadfd07b800e484abf2359e6d0ff155e1cdf16 SHA-256: 5b8e9b6d6e0fe23107329701e47233dff616353792828614c29df5f0d1dbedc6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, suggesting a link farm used for phishing or malware delivery. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://uktohabbarijamalta.com/files/file/reveruruvagawalupo.pdf
    • http://xn--80aikni6a0b.xn--p1ai/images/file/gijedufak.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nefagowuwulizeki.pdf
    • http://aaykpn.com/uploads/editor/files/vazusirukupikilupakigimu.pdf
    • http://vincitydata.com/uploads/ckfinder/files/delijudewizajebexenose.pdf
    • https://hanyauntuktesting.com/contents/files/21721386649.pdf
    • http://www.malagatour.es/ckfinder/userfiles/files/pebuxovirob.pdf
    • https://holocaustresearch.pl/nowy/photo/file/zoliwexap.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383fef608f7---gobuvefusode.pdf
    • http://le-bouquet.be/userfiles/files/93791949129.pdf
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/83430292209.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a167a4b2fb---92535966507.pdf
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/96113328266.pdf
    • http://ahcxdq.com/uploads/file/042224413256.pdf
    • https://normec-cm.com/ckfinder/userfiles/files/ginapibumabasul.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/2h8ccnu2edfo9escpjpmk6vm8m/10644145413.pdf
    • http://aucoindeshalles.com/menu/file/vinoratigajepedefikeru.pdf
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/54428157066.pdf
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/86043627726.pdf
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/fekinodefumo.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3fd303bb7---57113373800.pdf
    • https://kaowei.tw/image/files/20210906_170154.pdf
    • https://magerp.org/upload/files/tajepufidudajuvajixa.pdf
    • http://jedzenie365.pl/ckfinder/userfiles/files/14474646782.pdf
    • http://sun-apartments.pl/data/pages/49500424469.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=gta+online+ps+plus+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A3 16792 bytes
font_01_sfnt_off0000ccba.bin
f4c32e47c1d6a5a2fda6b95f3152a6e71cc30bb81b83cbf78a6574d944465482
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBA 10488 bytes
font_02_sfnt_off0000e4b2.bin
85b00c219658849e5827e6fbecf8bf4c39c670e69325d45515918dfdf1725fde
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 14220 bytes