Malicious PDF — malware analysis report

Static analysis result for SHA-256 459e807373750420…

MALICIOUS

PDF

89.0 KB Created: 2021-07-03 04:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2aa175e97a87b2cd2c932b68420a170d SHA-1: 0d03dde59adcb1924d064a5ad39a03f6e0640527 SHA-256: 459e807373750420588983719b9b74e83b2102aa1248b2003cbe6c5e46d27704
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple PDF files hosted on various domains, often within plugin upload directories, reinforces the attack pattern of using compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/a1a7262b0cf82f8b11eba99bbff7b65e/tovujijobadoniruve.pdf In PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/dufolujubazaneloxaruwofa.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/a49761036c8b938ff862bceb8cc1797e/kajux.pdfIn PDF document text
    • http://armanetti.com/images/pubupeniza.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/319065cc993574619eb4041481d17ba9/laxelamelenufevixa.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/garobupaxumezula.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d94ac4338d---95554928282.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/38308394124.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/9c22e4bdfbad2c0af61ecefc44f51815/10581636229.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/87911707272.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/1714316312.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/8c1f736d4b2529e09f4212dbe0e555c4/5748096827.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/e199d87e8806e213988f1feec06d2974/wimefabirokajikata.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/6f2f67bf0b1bfff8516e7777bac2ec0f/pelolufagulibokexobu.pdfIn PDF document text
    • http://esejsc.com/upload/files/2438115993.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/9kv269dl1pp43tthqipqdhurv0/43798802779.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/k8elbdse4sdscgcnupate7gc65/95724587388.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/kurarobamiraba.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/zonodaw.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa36498c1b0---37845419689.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/pijenawiwowekixa.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/mijulozuvo.pdfIn PDF document text
    • https://landbar.com/upload/files/runegaletudu.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a116c877c22---napaforiratozilademodiror.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/9fe755a5318549725dfcacc1420492bd/guxekegowanuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+free+car+games+pcPDF 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_off0000f98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 17256 bytes
SHA-256: a6397504b513ba608dcd1a54674e384a83e27625f8d1ae09a49348149f19dcfd
font_01_sfnt_off00012689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 10512 bytes
SHA-256: 16a36aba7afcdc2722b5fcd5cad149a538875de6417d40b1bc12ce25b2d4625f
font_02_sfnt_off00013e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1