Malicious PDF — malware analysis report

Static analysis result for SHA-256 4242a6a6fe622291…

MALICIOUS

PDF

83.1 KB Created: 2021-09-22 10:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a59d14318cb71b8ee7ce4e9e72166294 SHA-1: f2cbe10ae5747d70102c9d50ed31781c01deeef2 SHA-256: 4242a6a6fe622291251d4984166cba5fe4f5d245c5659aa6c777be9827ae56ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a link farm heuristic indicates the PDF is designed to redirect users to external sites, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript is likely used to facilitate these malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://carshopm.com/js/upload/files/46382944425.pdf In PDF document text
    • https://fond.ru/userfiles/file/nuzidakifimaxupirotovag.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/fimarapazivojazagi.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/fivofodelijokowukejix.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1a486530e---62217999671.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gal7iqe1u99tp5mc69ca1mbil4/86628473586.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/wolezetenigubotona.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/fapigidazodol.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/21966678345.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/01556eed8e8ac40d94759cd03077a566/sopaveruloximu.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/dumisozusivesege.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/43247355339.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/dusaboxarinaxutarexivav.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/fakifojafezenitubupawoxez.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/56940606345.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344116054f5---tepevinubiluwevawedegofog.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/legazez.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109152014181639.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/90554675937.pdfIn PDF document text
    • http://www.bash.cl/media/file/rizerebawivodizedilez.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/10185979655.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/bumegofafatotabid.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/3118814168.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/av9keqf7amned3nghfijnhcvms/guxilivufujemimewivepat.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/bakasirotonubuwaxib.pdfIn PDF document text
    • http://sinostandards.net/upload/files/61596592844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=unturned+metal+stairs+idPDF 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_off0000e001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF813 18072 bytes
SHA-256: 52ac114a8edff8f447ba591173911afc7ec1e86c5c821174f5085fc5e2f51336
font_02_sfnt_off00012728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12728 10396 bytes
SHA-256: 2012a9301e021effec86c730944444cfb1546d5dddcc12f68e4af332b45637aa

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