Malicious PDF — malware analysis report

Static analysis result for SHA-256 5947868ff55760c9…

MALICIOUS

PDF

75.3 KB Created: 2021-09-13 16:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81a78cba267c6f2d1846850d2a42d066 SHA-1: 6628bd72f9353b641ce826fec062f80a302b496a SHA-256: 5947868ff55760c960ab57a18812c4b05b8979bc6e75231d10a1df0b92c316ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The primary purpose appears to be directing users to external sites, as indicated by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://allytemp.ru/uplcv?utm_term=mortal+kombat+hacked+apk PDF link annotation
    • https://hkfew.org.hk/ckfinder/userfiles/files/66627863789.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/85469579631.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/97186281424.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332aa74f0e0---vopefukagipoberu.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/81281166710.pdfIn PDF document text
    • https://wonkingchina.com/d/files/89713712570.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/70064255009.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/zexozovimojugozawalivezul.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091219571542.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/jazuvevujimatenoj.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/77861535100.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/wigelevugadow.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1631024690.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130174a2b509---tojapukimup.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/xizoromuwasasesamazita.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136775560e8c---59624889514.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133eeba79b03---77612651689.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613425df5c786---pavukur.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613040b843229---8427822646.pdfIn PDF document text
    • http://weldingplaza.com/files/file/49916539243.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/55761168176.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/62460680236.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/reratawasuvodivugavu.pdfIn PDF document text
    • https://kuepancong.com/contents/files/kuran.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210911_130543.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/wuvuzifoleketupegabigena.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_off0000c3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AE 10640 bytes
SHA-256: cbbbae9bbe79018f807fea9277d51d3c79cfc84f76931306452a4fddc8c9b626
font_01_sfnt_off0000dbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 16956 bytes
SHA-256: 98740c3f2fd4d012e7be3e18bda19372457551a5cb3fd9e4bd636f0b0b3822e2

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