Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d46c726b65663d…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 12:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 505e04345f137fd34e18bf40e690cc5c SHA-1: 590eaab944c2f3766a17ec0604af425acaa8e723 SHA-256: 08d46c726b65663db1c8b3c7e30e47e4f03371e6a4bcbf76d11cd807cad2014f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ClamAV detection and ML classifier further confirm its malicious nature, pointing towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://synerhu.ru/uplcv?utm_term=samsung+galaxy+nexus+phone+review PDF link annotation
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b01dc01c6---39874520942.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/58439093671.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/xuwatitanemesaril.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/98933118259.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/nobewagutogoto.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/97470681121.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/m3db0kbtv7svescgb76vp4996r/57887801392.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0012fde8974ac480f67e281823ce1e98/zefazavoburitebadididod.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/40979337127.pdfIn PDF document text
    • https://najemwroclaw.com/userfiles/file/ramonamoxalibewepov.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fda1a67fa1---teloju.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/37624732057.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/magobijubadametovozow.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/7018628767.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16149fbe3bf365---9612436506.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/f3ee1c30376b6303d9f226a59d1266fb/24629842626.pdfIn PDF document text
    • https://geniodelweb.com/file/91567786105.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/74761182970.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148df3ac18f4---44726476895.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/pufupazolotagug.pdfIn PDF document text
    • https://petala.gr/userfiles/file/82420618831.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/52317440001.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/zikedanukarilekuj.pdfIn PDF document text
    • http://cutskytools.com/d/files/91848531293.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/91525612819.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/57062742803.pdfIn PDF document text
    • 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_off0000b16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16B 11144 bytes
SHA-256: 16d1c4e041d6f240cb9df35942c85e3c8dbde72f4a37f8964bcf08f68439838c
font_01_sfnt_off0000cb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 14928 bytes
SHA-256: d83e77f49be06849ef2de43f2ccf9031f110525500d701d0ef6716a177cf35e7

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