Malicious PDF — malware analysis report

Static analysis result for SHA-256 27441d36222002b2…

MALICIOUS

PDF

79.7 KB Created: 2021-09-10 12:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 168d608d754ff1365dd5c23ce80fc251 SHA-1: 7c7a66950aa527891452b5957a51a5898ccd20e8 SHA-256: 27441d36222002b279c80344355a4f5d86883b78a7546f94b8e7bdd5f24733e3
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to disposable hosting or compromised WordPress upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it's an attachment in a spearphishing campaign (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://daaeportrett.no/upload/file/jexisajemavezuxa.pdf In PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/pawaziwasigenabojomot.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/76499955771.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090122481373499.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/20859658130.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/rewiwopita.pdfIn PDF document text
    • https://sanagustin.cl/files/pifojujikasitadakabu.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/1fd1d5295e91a6402a7548cc7d30be0c/divifemuxonulagefeg.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/kumolug.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/3032175924.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139dfdcb6900---90470405811.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/43542833974.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/rafobenajatutinonibi.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/musewazuzinelavij.pdfIn PDF document text
    • http://cl-pub.com/files/files/vavirirogezadakipazajeloj.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377ac52774c---dutasenosiki.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/28155716067.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/30170876780.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac504b744b---7502363360.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/13058730034.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/59395874773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=play+pokemon+ruby+on+pcPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/vaxapejuxef.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_off0000d041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD041 18760 bytes
SHA-256: 3bad9aedf924139348f64e959175633101f350d7fe94aa817d68ff1546850400
font_01_sfnt_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 10624 bytes
SHA-256: e0c834d958b72fe673b76668e32530a5bd99b87bdd2a4394aa3f99d725624707
font_02_sfnt_off0001197f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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