Malicious PDF — malware analysis report

Static analysis result for SHA-256 610a84a85783a6da…

MALICIOUS

PDF

90.2 KB Created: 2021-08-21 01:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f189f9f6dbccf629ca9ac5e7962f11f SHA-1: d5e86b7d95fddf93c6af821b5b05b1b961ae8508 SHA-256: 610a84a85783a6daa645cfb35a9802d3744b3574d95b1e78f81a049abb203f1b
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://plentis.eu/ckfinder/userfiles/files/16345703561.pdf In PDF document text
    • http://dekoblickfang.de/userfiles/file/woguke.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/werudagasigetafur.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/11258222870.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/25846976245.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094adf504240---sozimozenu.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/74c278809485910796e3b67be494887c/womipexiwasidebopojinugol.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/rawaredopixu.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/gopivuziwukolone.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16092c871cffaf---mijagolizifamovenedone.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/posesijumimajevunemawu.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/duwodudoxiwulezurabesaxat.pdfIn PDF document text
    • https://dhcom.vn/userfiles/file/64177799132.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/31477021923.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c201b05e16982bda92413eaded6dd6cf/92030915646.pdfIn PDF document text
    • http://polkovnik.su/upload/file/tuxab.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11fe91da63---fojumob.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/31618667967.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160e97beb29c44---xobuweresokan.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fdaa1b40e---fuwifofemu.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/f9b8f8bff4b393c5b40686311d59ff2b/43839421519.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c778bcd07c---81033093844.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/zogan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=introdu%C3%A7%C3%A3o+a+administra%C3%A7%C3%A3o+maximiano+6+edi%C3%A7%C3%A3o+pdfPDF 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_off0000f456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 20292 bytes
SHA-256: 3cf5a93c3d62e2ced4303eb779dff74548b4afd2575c46e890026c21950457c8
font_01_sfnt_off0001256a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256A 11400 bytes
SHA-256: 2759b1e1e1998964811595e8663489ac0746da73ec0877babf87b97e8044dfe3
font_02_sfnt_off00013fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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