Malicious PDF — malware analysis report

Static analysis result for SHA-256 595f9f9069d20383…

MALICIOUS

PDF

79.4 KB Created: 2021-09-12 23:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5690b3b0028eca9a727bc93daae5d8c SHA-1: 6602c17b9811d4dc0b23c1bffea87d43a76d1711 SHA-256: 595f9f9069d20383c5224fd7ac118c341a1743aeb3ed7d250daf64d563549c94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple URLs pointing to link farms. These link farms are hosted on compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content or further malware downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://triatlonshop.cz/userfiles/file/jikikej.pdf In PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/628536584.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/12940987399.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613132a856ef8---vuvodazipixejoweg.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/vuninitir.pdfIn PDF document text
    • http://myphamasia.net/upload/files/kusitubojaxakovox.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/wavuwatukuru.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109090125099069.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/31563627892.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/95827764524.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/xikujanejivalen.pdfIn PDF document text
    • http://kunbot.com/upload/files/lagepalare.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/40747699706.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/setoni.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/66309487269.pdfIn PDF document text
    • https://photojet.net/userfiles/file/sinafenokagiferowepavuxim.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/fufexaxaxokeluxege.pdfIn PDF document text
    • https://protum.se/file/fagubefetifolofazotovigu.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/kefotexija.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/31693296471.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc52a65f44---kiwuwejajuwozebalube.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/9711910882.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/l1l0b4ffsoetpi7d5bo7r0lcd7/terone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=loveshhuda+full+movie+download+hd+720p+blurayPDF 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_off0000cfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCD 17492 bytes
SHA-256: c25786396c228ba98ddedfa22058b3f9c3c0e67c3f89efc5484c3c63d957673a
font_01_sfnt_off0000fd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11562 11420 bytes
SHA-256: 9068415667a92ca75ab72ef564e066388e6b16048d4a403d2b4908db470e19c6

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