Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0f9963c72e2035…

MALICIOUS

PDF

76.3 KB Created: 2021-06-27 01:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ab0be604bc95d7b6073d88182814dde SHA-1: a441da6f825fc10adbad336dfa930ed81091edda SHA-256: 4b0f9963c72e2035c71a28c5ef5bfd6fde31daf725646b90102ad132921c2622
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://angelojrobles.com/admin_initial_test/userfiles/file/92772826055.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/alb3iidefmad45ufv25clg671c/12040924769.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fce97f6fc---bevexem.pdf
    • http://avandcie-automation.com/ckfinder/userfiles/files/lezaxagajovizobafu.pdf
    • http://westernmaki.com/uploads/files/67382692253.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/nibugijenoxexitonufaraj.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e886f4d4bb151d3b246401213dc32519/47335790847.pdf
    • http://brmxn.com/userfiles/file/20210609114445_r7sdiy.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/b2a619db6748c64310681bb4ddff5995/31457192367.pdf
    • http://graficaeformazione.it/userfiles/file/vudazumorekeratikatopo.pdf
    • http://augustaelectricalwork.com/editorData/file/sinoxirinamagi.pdf
    • http://daydala.com/userfiles/file/fewajuguwanesebubapixetu.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd8ac09455---fupego.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/6ffc2fd1a02402119b0e0f4aa118dd8d/23626596704.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160703bc9cca58---79013055015.pdf
    • https://thietbidienmanhcuong.com/upload/files/16851784505.pdf
    • http://ourhkg.com/UPFILE/userfiles/files/zogowovokizazel.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bff49680bc8---74648841600.pdf
    • https://bisnismedsos.com/userfiles/file/wanasugilobevamemalulo.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/8gbgfsaq5qpgagd8h3jat205l3/rinirujal.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0efefa1657---6280756578.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a940266efd0---vekujafugizuvasixeseg.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8e47d1e7b1f33040ff69abb9ef1e6137/meluninofof.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pdf+text+to+excel
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8f8.bin
9b7517367ada2f54694c4270bd566afa0b00359d52ad98859efd4f8d21bc76db
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F8 17116 bytes
font_01_sfnt_off0000f60b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 16792 bytes
font_02_sfnt_off00010e21.bin
cea442574960f9cc404fabad88de3ce527cadfeee71a925b19c8f7d5dad6f7d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 9944 bytes