Malicious PDF — malware analysis report

Static analysis result for SHA-256 984596f837917cf9…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 13:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fa6488a9da44a9f991b11c4cc1cd2316 SHA-1: 6266dd0acd7db24fa2a94aef137badff1f1156c5 SHA-256: 984596f837917cf9c95d5154aa0723bfe1ba33af17d59c206f5304bcf1235d15
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's primary function appears to be acting as a link farm to distribute traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nanyangtextile.com/userfiles/file/remafopuja.pdf In PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bd1f9c26ded1ecbe7b425d10dd0fbef5/83711968219.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/qkqpo2lande587u2v454q7m915/zoporuja.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cedaeb54b---7815411997.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/botuwigefimetugep.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/it57a7i40mtnln3sfqbte1otb7/jepuz.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/mebebejiwerexewasi.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/66774189843.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/47966639550.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/74547771924.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/15352499962.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/83375003335.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b98cf0bf179b0fc86832c6b251070991/rikubedov.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/tomelipajitimexatek.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acdde735f34---kagezevumusape.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/23447819863.pdfIn PDF document text
    • https://bio86.net/fichiers/xasuj.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/75028878162.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c8f942f9f---62721636461.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/60883580952.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788d092909a---28674519874.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0057c66018---69776877223.pdfIn PDF document text
    • http://boxethai38.com/upload/file/wisimedawom.pdfIn PDF document text
    • http://rooptex.com/uploads/zetaxosovajarafabivik.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/dukululuxax.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/bijiranetif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=stay+hungry+stay+foolish+pdf+freePDF 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_off0000e07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 11064 bytes
SHA-256: 850612d10608d38bbd89ea3dd258e8dfcb06a418bb6fdc4717ba2e9f0a09ca99
font_02_sfnt_off0001120f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120F 18056 bytes
SHA-256: 95c0b628ca7d7119fbd9febfcd98200bbfe5a1b3ef06238205fa23077b34647d

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