Malicious PDF — malware analysis report

Static analysis result for SHA-256 368905cc3cdbce2b…

MALICIOUS

PDF

93.4 KB Created: 2021-07-20 02:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b75116e5deb3b2bb43f6333261919443 SHA-1: 0b7ed17167cb59fbc25ec67817092a2c9707ead5 SHA-256: 368905cc3cdbce2b848cfbb49f858e2b0d7423f15cc5dc3cfaf6ba0173ab040c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to manipulate search engine rankings. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://webbuilders.com/files/file/nuxegavepirudejiw.pdf In PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/9656416627.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deef3bcd347---tigejenapidusisitaba.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/e1b00m72vkbtksbv49t4q1llgn/32255373659.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a9578cb24---lusigadisamipudigito.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/disevevawevod.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/donesodinosorofite.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/cad259a76bbed2fb1c65c187d3f4a4b6/99155433632.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/561a1fc0505da11c428f981701db284b/81032406327.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/19b26689a0fe5960638bbfddcc66308f/14989167265.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/111354158975.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/lubefenijuzureku.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/74847901951.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/31406704497.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/suzemisigod.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/51159927276.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b630130f4f2---bijazobixunu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cad7479bb---dapes.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/guwefasir.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/keweromezolak.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/spvv3u1m1p9t7jnn28712ouvk5/83767639155.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608967817d764---34428043949.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc8cb4f77---jetiva.pdfIn PDF document text
    • http://katachizu.com/img/news/files/71261930045.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608064d534974---vunabusapatofirolesax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+put+words+on+video+in+imoviePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F3 17808 bytes
SHA-256: 7ff16790adab8bb0cc478e75a0a60f67767f3cef440f6b8d5166121c19ce8f5a
font_02_sfnt_off00014769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14769 1732 bytes
SHA-256: 5c6c785476e112a6f75a41f06a02e059cdfb235959dec2f331dec4fc21c5e077
font_03_sfnt_off00014fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA6 10588 bytes
SHA-256: 2f30990e1d4978b2850b2f73cac8f7bd3d6135f7cc3a6c55ead84c43de2db186

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