Malicious PDF — malware analysis report

Static analysis result for SHA-256 8153f3d70392ab5b…

MALICIOUS

PDF

110.5 KB Created: 2021-09-18 09:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ee6689e354b5f7aff0532aafa152719 SHA-1: b79e235ff036ca711755d0117ee5f855e2d15344 SHA-256: 8153f3d70392ab5b3e83fe87912191db41a287b0eb779f1b88186cfdf8892452
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and multiple links to potentially compromised websites, suggesting it's designed to download and execute a second-stage payload. The document also includes a lure to copy/paste clipboard content into a shell, indicating an attempt to trick the user into running malicious commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://karlholmbygg.se/UserFiles/files/36731617076.pdf In PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/56880363636.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc8f18954d---bufikedanusoma.pdfIn PDF document text
    • http://identik.hu/editor_up/84121209243.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/8560779730.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/difowuguvisezob.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/7372451266.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/e38aa0e899c973d2407d5e09ded7f2a0/28508370596.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/luxit.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/dewisiza.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/3q6rs8p6sq11bqmcqo7rqvo2je/60295783171.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/53935564934.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16142d9c0b0c08---53452293956.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/jokedilogavefifajipi.pdfIn PDF document text
    • https://tigaintan.com/contents/files/76694815455.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/4840331859.pdfIn PDF document text
    • http://vaynhe.com/upload/files/40040549944.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///famevar.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/palumaw.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/14797277174.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec730f1fb1---metaxe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136b782150fb---94152194991.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/77227565064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=windows+7+service+pack+1+64+bit+isoPDF 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_off000142a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB9 20564 bytes
SHA-256: f7334b4c0290a51257222ad1f0cb85db1558dba4b400ed1e8bd746b2a7b95db7
font_02_sfnt_off000191b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191B3 11188 bytes
SHA-256: f045f33ba381cdfdca5b714b55a57344ec95dc00a0ed5a5c13b2a81c8768d82a

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