Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ffaab5e64cf9c2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 02:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0b1cb6e01b2f92161e28e23d3b9b3a80 SHA-1: 3d165ac3b07029d5f3ead813593e3aa74c8090ed SHA-256: 58ffaab5e64cf9c24c37a825f3703db0a2891fc8e545fb83fdb7ca513c5342f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://krzczonowice.pl/gfx/file/25235605399.pdf In PDF document text
    • http://oaklandscreche.ie/userfiles/files/89102378709.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/ganifibuvuwaw.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/25035002602.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/58562845595.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/fowatili.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614639cfec5e3---segeluvixodopavajo.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/jezumonugalozi.pdfIn PDF document text
    • http://adice-area.com/pictures/files/64627689559.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14337610357.pdfIn PDF document text
    • https://securitydm.com/slicice/file/26285980391.pdfIn PDF document text
    • http://showdoimovel.com/files/files/novew.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/25641480260.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/51521496587.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/32030375883.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/42496342120.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/7676478274.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/logufefan.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/2547864854.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9n4fb05lff30ai96rd06vj827q/98432878508.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/49756941769.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/tojutiwaxulomu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149163644ecd---41033896420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=notepad%2B%2B+compare+side+by+sidePDF 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_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 10756 bytes
SHA-256: 7762698a718d147105e1721f4ebd82efa104998f495614c06894bec4804ef075
font_02_sfnt_off00010d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 17880 bytes
SHA-256: 0cdb478783215978b90f7748dd397d04a7b7cea11ecb4d0d7591c4fec058da17

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