Malicious PDF — malware analysis report

Static analysis result for SHA-256 6591738f7e1a6a03…

MALICIOUS

PDF

84.4 KB Created: 2021-07-16 10:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f667da4cc187d793fa328899ba8283b8 SHA-1: e83688b78a22c3fdfe1a253081859ceedf4548f8 SHA-256: 6591738f7e1a6a035d570bdf80a742870846666c338fefd13f824a80045ed1b2
204 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The heuristics indicate it functions as a link farm pointing to compromised WordPress uploads and disposable hosting, likely to distribute further malware. The presence of a remote support tool lure, combined with urgency language, suggests a social engineering tactic to trick the user into downloading and executing a malicious payload. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware distribution campaign.

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://shukokai-voves.fr/userfiles/file/jamuzagusutifarosupukamux.pdf In PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/savebi.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/61717723205.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/wejitevaxowe.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/59876366040.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a589198eaf6---61417434842.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/02jm3q3doo0t1eonvm6anvk2t1/51725431890.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/42706794466.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/8474682699.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e8b4ac95a---73996520814.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ika3312krfoljvbo8vjm2f0a2d/takipujirolovilulesepe.pdfIn PDF document text
    • http://pneusmarene.it/images/file/99701287217.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4fcc3264a---fogojiwesokuwo.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b8e10678e09433a13d931c43934f1cd9/76001208432.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/h3e57rrlsm1pvbn9oke49lm6g7/xobez.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/49eb033d005592fa582ef0e4acdeca1b/49169145838.pdfIn PDF document text
    • https://aspirans.com/files/file/dusurolabezulivewoxan.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/volodemuwifunixukiwififi.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/nexadi.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ac5944d20---41961184118.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/20329504306.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991cd073b99---91063351404.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/sanedofatekuwumubefilop.pdfIn PDF document text
    • http://acgroupenterprise.com/userfiles/file/83639392623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+tv+remote+service+apkPDF 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_off0000e71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 16960 bytes
SHA-256: b06c3b1fbe1ea72817ba0277affac92260d9e38b350f0fb01bf7c1b6f8e88fff
font_01_sfnt_off0001137d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137D 10768 bytes
SHA-256: b5f2969526c3445b146eb9ac0205af741a8634d4edf39bacfd0b30a6eb78e9e5
font_02_sfnt_off00012c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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