Malicious PDF — malware analysis report

Static analysis result for SHA-256 87aaf7a36d9af866…

MALICIOUS

PDF

121.0 KB Created: 2021-06-26 18:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8846a660dad8437be202e9e6de6c595c SHA-1: 59c973863249ea089b0805aee40bc843536fd02e SHA-256: 87aaf7a36d9af8664fafaaa7466d3f49959966277ff4409b4cba6a6af4045bdc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9777

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 http://ankaser.com/userfiles/file/55300278681.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160877bad91cb7---tunaripiranuxi.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/616iru6c1bhkunclmciq5gagmd/pejejosamede.pdf
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/18439132777.pdf
    • http://watthaistuttgart.de/userfiles/file/natalipazikukatijuguf.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09ddd4ad44---sibokegexaganuri.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/4fe0c889fea332fc6b1442e54add330a/luwodiwawowesokuvalego.pdf
    • https://cape-electronics.com/media/file/26096923961.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3e7cb2e0b---divofaxikuzivo.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba4a052ce1---45380587892.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/cb57370e8ce6185f04c0e8715abc0dca/xasubaronip.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/93632100e9858086cdf6b6af23dbef11/27140972715.pdf
    • http://vencedor.coop/images/admin/file/lujusafobiguwozen.pdf
    • http://smclassof57.org/clients/34860/File/47624477044.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/ruxuvivi.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/8586eaa09b677a8308d3f7d746fdfd52/lewiverotupe.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607098c1952fa---banezamebutewozamedu.pdf
    • http://creptiles.dk/userfiles/file/56820808735.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4329741420---voxidunutebug.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/7c02430353963775292caebe6142e9a0/14657088659.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/8dbbae62c9d812c0285900b41680de1a/luxudidagajuze.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4000bd5afb---1555920867.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=diatribe+meaning+in+english
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db2a.bin
5dc6cebd13fff04ff7acaceec7011ede364da803819c7d6a2f2cc4f1b2909596		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2A 44540 bytes
font_01_sfnt_off0001512a.bin
0df779d354f8efde9cc24edb65295b0479f32f9dcf3e1a93d6e5914abe3de64f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1512A 22152 bytes
font_02_sfnt_off0001892f.bin
12fa10b9286f313d9ece12bb61cd75f9d0c345612ce663ebb7aeb3d7940fe525		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1892F 10576 bytes
font_03_sfnt_off0001a119.bin
1a7b3bb38cee07f4c7f7a3b934f59b6a7841c5bbbf9cf2f745f5cd2739fe9769		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A119 18276 bytes
font_04_sfnt_off0001be04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE04 16792 bytes

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