Malicious PDF — malware analysis report

Static analysis result for SHA-256 041a04ede09873e3…

MALICIOUS

PDF

70.0 KB Created: 2021-10-04 03:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dce9df5df6d6cf6ae039ae836f248151 SHA-1: 7dc287b445f4c26410595b7f01138a57bcad9ecb SHA-256: 041a04ede09873e313292fb8b63475e32c0e2efb70b32d9d7f2775ac165ea003
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is a common technique for initiating malicious actions. This script likely redirects the user to external URLs, as indicated by the numerous suspicious links found in the document, including those hosted on compromised WordPress sites and disposable domains. The ClamAV detection and ML classifier further support the malicious nature of this file, pointing towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://infrive.ru/uplcv?utm_term=mountain+of+hell PDF link annotation
    • http://avtrak.ru/ckfinder/userfiles/files/parinawubamabuvozu.pdfIn PDF document text
    • http://tano-cable.com/d/files/61720979761.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/76188175897.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/11911146718.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614bcbc63193f---lilizemegiloboke.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/xigiwamesorinajawileduvi.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/74978229470.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/nuwokinurigijofilop.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/barulobajapitowuj.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/dijuluvap.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/71213905631.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/pikuwamolipizeximabuf.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c22f237bc4---19907608224.pdfIn PDF document text
    • http://dakov.hu/_user/file/safale.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/64f56a23388cb937b1d91ca88c35c26d/gawenagezexupafaxeluka.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/xoloresovoxes.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/feferimakujanefakosoxa.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/maguxadesatatozokow.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/9968505277.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/6487668188.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/zawelikoz.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/wuginokipubudesujawat.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/29749429272.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a987d4aceef6254325ba5c0f3a812e05/bilagabiwabewolagudofi.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/fuwuwevefivarapusibusu.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_off0000b4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BA 10136 bytes
SHA-256: 474befa4addc1ae0ac839230c16c52b943ebb62042360726b099f999bd642921
font_01_sfnt_off0000cb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 15620 bytes
SHA-256: df9b52edc2fcf2c61c0d0258690578542655236444fa38ef797e6c0aa2ba35d2

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