Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4e6a3dbf76ecb0…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 00:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d61aa668366f8f93ff3318046850a58 SHA-1: e9b4862598a324361d754a7f96ab658832defb01 SHA-256: 4c4e6a3dbf76ecb005021f3b114d23de74bb4bfd0fd52232f38cf6a8eb21eee5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple URLs hosted on compromised CMS uploads strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • 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://medicabg.com/uploads/wysiwyg/files/pulizovixapi.pdf In PDF document text
    • http://lapawan15.com/shop/fck_file/file/ruwabuxukavox.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/205420ccc277d7ed0c4af3e9c2f361a0/fuwiwivetowegopanuledoda.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/d9597844d90c47f8c76f6ee273a3042f/90801071107.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/detatenodugibo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cef16d83a---5093724733.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/efpqdq1nl61mksknqhbfqbeqrd/25505699174.pdfIn PDF document text
    • http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/zowatugofisotebapefig.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/75124106177.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/81976167006.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210724_6836852E5C0CB7FC.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/45074336029.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/19970602519.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/rapatijetu.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/67566604687.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/siwepuzekijakifejag.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/91421671270.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/kuwetazazi.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ba8it75osul2lkcmnitc46b8bm/fewek.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/93008526600.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6fd25dee00e45c132fa043d08d359946/73547003043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pdf+to+excel+converter+free+download+for+pcPDF 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_off0000c4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD14 10608 bytes
SHA-256: 1a56c9a248bf4bcf76067620bcde9b565a13edf9ae4f154d9ba5d75fe531a227
font_02_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 16416 bytes
SHA-256: 1ea6e37fe6093f81fae740ecf41189d7cf636b0a7a959141ff36476024496a7b

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