Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5741c4e77252052…

MALICIOUS

PDF

79.0 KB Created: 2021-09-23 12:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 96ff4ab1ee550179a6032d9a52c2e261 SHA-1: d64f3d1145813a03388c6cc55a901385e83b8db3 SHA-256: f5741c4e77252052ddd5e36ae56d63489da4b92afd2062a746ea530b18b74273
172 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users to phishing pages. The presence of a download button lure further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=hide+clock+android PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a18d4a0d9b---14371724458.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/90155509751.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/gapilegekasujefo.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/75653069427.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613305124cce9---xexibigefijagexudaneniku.pdfIn PDF document text
    • http://safetruck.gr/images/file/49303429164.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/sikasujodajidebur.pdfIn PDF document text
    • http://sinoorchids.com/image/file/25487340497.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/sezutorakutebudiv.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/mevukexuvagujigajebafeda.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/29489906555.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/lonexevowipim.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/foladuwivop.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2109110755316149961hg1nr.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c98c9cf33b---99354852162.pdfIn PDF document text
    • http://aromata.ru/upload/files/sadukidupubugibeku.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133dedfdfb98---rumejenale.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/vozozowefetiropido.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/99263033684.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309526e6fe3---97546488259.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbc60b1e6e---gerekisuku.pdfIn PDF document text
    • http://househouse.it/userfiles/files/sunomenikolan.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_off0000d18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18C 10180 bytes
SHA-256: 434df9b9a17e68eea20535ec947ce4dc03afb6efb3065ba86ad5ecf79d32dc33
font_01_sfnt_off0000e852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 17852 bytes
SHA-256: 6f3ac2f8e5adeab60676db7f86fce3e8b4e4f4c4f4761f3b6f8642a3d207dae2

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