Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bdb1aed0fd65931…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 00:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b293f1d81a6b41f9ad1cb7fdfaa9d6d5 SHA-1: 4589b409434673f435469a58f22b6497363cb635 SHA-256: 9bdb1aed0fd6593115d16dfe54251d51c327d03ffecb5e19f0e1515f11075a93
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.injamal.es/nueva/ckfinder/userfiles/files/26660129222.pdf In PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c2ae7cbfe---lolunitutopowabizixarovoz.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f5758f1844c---ronovisaxasapalajasumo.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5a5b44255562706e3ff5d566603af9a/29870443338.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/21685483902.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/d8eaac0bb2215a1c77c94048177b3089/95422917715.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/ganadejitisezogebejedo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8b78d87c8ed031cc1a11a892130572d4/kexavigozo.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/7da777ddf362e4c85d4bc2598a867986/tedoralovimaje.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1ec3c83b0---23448928506.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/lcvunf3i5b6fkm888uhl0j5uk0/42402005693.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/30365469206.pdfIn PDF document text
    • http://195exim.com/datas/files/98617611081.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/12520030976.pdfIn PDF document text
    • http://deforma.it/userfiles/files/raxosotezexinixezujozi.pdfIn PDF document text
    • http://artospace.com/pics/file/11705601866.pdfIn PDF document text
    • http://enewind.com/pliki/file/vumomarogobidogibuj.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85ab4d5585---vizifupexaruzikid.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/38474680558.pdfIn PDF document text
    • https://artenika.pl/fck/file/18273873710.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///vekeritapurikebegatijuw.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/movoputitedupa.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60fd2ee712---tivurujaderotidikogetilo.pdfIn PDF document text
    • https://sealskinz.ru/files/file/11622112364.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117e07f3a4fb---ruwuxakawitoweba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=optical+illusions+and+the+brainPDF 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_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 17512 bytes
SHA-256: 91b1490682da423c7553d01566c6777c87a47744a163c09e2ecf095673080cb7
font_02_sfnt_off00011d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4F 10876 bytes
SHA-256: 3837a972b05d4397388372d86fdd7d14024221e3e552ab73c8e19cdeb60b754f

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