Malicious PDF — malware analysis report

Static analysis result for SHA-256 4935f8fab30745b7…

MALICIOUS

PDF

350.4 KB Created: 2021-05-26 02:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 370417a7f4b3651fa92491ef7a1c2c1c SHA-1: 5e68b6e152fafea7213d99683c46354bbe43afbb SHA-256: 4935f8fab30745b71c3c0e14237f914c128c6c4fd77a0e149ab83b1c717b1b0b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous links to compromised WordPress upload directories, suggesting it is part of a phishing campaign. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document likely instructs the user to install remote support software, a common tactic for gaining unauthorized access. The presence of embedded URLs and the overall structure point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=devops+tutorial+for+beginners+pdf+download PDF link annotation
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a1c8804e9---vanuporotezupekupew.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/sumad.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b2afd8870---74213306072.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089528a32fe3---bafegu.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/1cdp2dj4eruhgfornmk1s3tiu1/91918884983.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c99b8b1cb7---24199875457.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/907148a4ff1461aa61ea865a40badd47/ragowirolufegejedezovo.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160851419107ee---tijijusitupajazej.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160732bb36f36a---kovag.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/8599692702.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f817b5d7---25070228655.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/dba7de2f42296e8906c38f81a4d95c35/poladigato.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/289c0f417e0e39259d2178ed44eb56b8/fukowobesukobinosariruvom.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f81b596a5eee0e47eee3392f2da337bd/livereliragaviwomuseberub.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090f957af112---fazaridajisusokuveferaw.pdfIn PDF document text
    • http:///nagios3In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0004f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F463 7176 bytes
SHA-256: 253568954ea00b808fecfcf19677b3e4bec7ef6dc3e0ee901447001aa580c862
font_01_sfnt_off000506d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x506D7 5500 bytes
SHA-256: 911e9af53c63a83784c4bf446f2431f247c86a7ef225956138862f1296ec1adb
font_02_sfnt_off000519a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x519A9 3812 bytes
SHA-256: 42f50cca9771542a9c67608b58840477427c2fd19cd06e9121ae7e6b8584922a
font_03_sfnt_off000528e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x528E5 12824 bytes
SHA-256: 61e136c29623ade358319e7947c20bf7cd69366ac7b5642c1007edaffe21b2b2
font_04_sfnt_off000554c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x554C6 16116 bytes
SHA-256: 5ec139a263af45d7cbac1bc1a000173eb4e7f97797aba0f35ce2e37505b4886e

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