Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae311fe058bceee5…

MALICIOUS

PDF

83.6 KB Created: 2021-09-11 01:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 70d2ce421d77c5a39e86f3f3aa1e0b82 SHA-1: 1e82652354c478d811fcd43dbb43f21477c838b0 SHA-256: ae311fe058bceee5cfec570a2870da80abc7b67132b3d17520ef1484f536da31
204 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and contains a lure for clipboard command execution, suggesting it aims to trick the user into executing malicious commands or downloading further payloads. The presence of multiple external URLs, some hosted on compromised CMS uploads, reinforces this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • 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://www.winsum.frl/ckfinder/userfiles/files/11385844106.pdf In PDF document text
    • https://betentour.com/sites/default/files/file/13932751930.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/93378498189.pdfIn PDF document text
    • http://asqcert.net/files/files/gebigogav.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/56031588070.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3bbaf7427aaa9c685ed001cc1adb5856/rilidurivanoragibumebatur.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210909_125423.pdfIn PDF document text
    • http://tayles.com/uploaded/gamawe.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210901_040822.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/3839048974.pdfIn PDF document text
    • http://spiregene.com/image/files/20210910_023045.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/70971758307.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b791e768bf---92800683900.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/pijowogimigupakaxusuwoba.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/51141512458.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/92572009185.pdfIn PDF document text
    • https://campermagazine.tv/public/file/29397132429.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352bcb76c28---57446073572.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/81585158552.pdfIn PDF document text
    • http://strandedtattoo.net/file/lutalemalumirajamizizaw.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/rirovozuni.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/defoniwexofudi.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/99354965324.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301be528c93---48632489349.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/19589510695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=windows+7+home+premium+k+32bit+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_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 19152 bytes
SHA-256: c717fba9bc2e58ff321794ba95e95e5324825e8fed091464ec2298b9a6c79f12
font_01_sfnt_off00010e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B3 11200 bytes
SHA-256: 2da9e53ea41bd4d56051e363c049d2d00c880908dbad251846f8d5f54b8b9ec9

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