Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff2738bd1c9924c…

MALICIOUS

PDF

97.1 KB Created: 2021-07-21 20:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d93cdf3329cf514ab1b5a2ee84d1eb3b SHA-1: f2c2361f7e25f0a007676abe19c98ca9511b9395 SHA-256: bff2738bd1c9924c18bacf43dad1fd4976729078be09aff14cde68d63861d1e2
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Additionally, the document features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7180

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.
  • 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
  • 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://brezov-gaj.si/uporabnik/file/zuripe.pdf In PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/kemapukumusupumuxiwokevel.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8518f53263---61752638696.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/zowodazanenivimasoxo.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/wabidew.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/lh9iiurc8dnp4rm36c029lqmjb/21491456184.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/dacafa5b838ccac4ac5c43caf00c9c50/jerowid.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f13c05cce---dexaj.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/86831275549.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/girowoni.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/88234077074.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/75913553843.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/68634609919.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/24042351317.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5eeca368db---solamepamidipilekefiki.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/98caf6d9c10fade0dd1cd80355b07362/kezinitun.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3becb7d32---morufewaxijalokenojopa.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5fe9f67039a7dd202ad226bc5a2f5879/todawewawixutovediv.pdfIn PDF document text
    • https://motiv8workout.com/up/files/vukibowotu.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/i3cbe6o2uvpb9g3o0qst3citge8oaso2/jitinabaxobiredijusuz.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/efa89c84a5739f29d61cc2f955dc987e/titobuliluwesosa.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/jivuxegetojewuniwa.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608333c6a4f09---lenazulopofakanoza.pdfIn PDF document text
    • https://airbays.com/userfiles/file/bawuxosironapirus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=history+book+12+classPDF link annotation
    • 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_off0001293d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293D 17648 bytes
SHA-256: 7b04f516faf8966e7874ff40c19e739872623677ae56ffdb2ad546a4bb1542a5
font_01_sfnt_off00015711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15711 10496 bytes
SHA-256: 67f8d46307d09cd6a852907e867a5e407444fba2c2523ea79c4580e9a7ad06f6
font_02_sfnt_off00016f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1