Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d40d01fb8d2d3b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 11:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb962971c21b72fb09779072d5a93294 SHA-1: 89cb989dec63376739891dc22086a2b0aca30c24 SHA-256: 26d40d01fb8d2d3bd9208cf6116af32a65873f459b4d31d11eb2188dceb0103a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting domains. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/04af1bfc57335bcce323ccc3f25adf1d/kobowilosepaxifejax.pdf In PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/monujefoxukimepilofidize.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7d6590fdb---67086678763.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/vaxupegudejebow.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/48256391976.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092104c96c14---53544238719.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a35f206f18a---lodixurebiwabav.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/xizufefunevawibedixipolog.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/25540882042.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/25095829586.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/82470951809.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/16413255314.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/aaac2cf99bf2624436bb3a2fdf812de1/jejajoro.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/fitivusaterep.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/75070185192.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/51974848078.pdfIn PDF document text
    • https://amgaa.org/temp/files/98862966374.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/ponufenemekemuvojoro.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78c5ac88b---26231344199.pdfIn PDF document text
    • https://nevisnews.com/userfiles/ronupibabipubizusa.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/75819677233.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f9fb86b23da7f7a5c590ff2eb1cf9b0c/23717724151.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/97470042771.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ee5d58936---81340608141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=halitosis+en+pediatria+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_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 10480 bytes
SHA-256: d23d331880d61fa4d8fafb856cca566ceaa266ba625b18744e92442a5f1390d5
font_02_sfnt_off000112f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F6 16800 bytes
SHA-256: 041d93f6ed5c4b888badd29ae46b68e57dcf791e6783fe472548bcaa7942deb4