Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8a9372ba474c8c…

MALICIOUS

PDF

93.0 KB Created: 2021-09-06 22:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0a821c30005bbd46e7dd08d1ad136d3 SHA-1: d774e805806f2fffa152304ab9b8227b86125288 SHA-256: ba8a9372ba474c8cb5f23021c1c2d6b43f2eb0eb02e91efea2366d11788876bb
156 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. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites. These links likely serve as a lure to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607824bd47008---pijudaxovof.pdf In PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1a18c06f5---wowonesulupubemulesoba.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/wekenomidu.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/3l37g612dgtq7ev8k8ecqgs9uv/gepanapigujo.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/80696230792.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb575690ff---susipazonexil.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/1440313096.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/lutolekipiwafovubijavi.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/72146754391.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ef780c8cd8f5b480a581aafd1a15469f/zamoveriposebef.pdfIn PDF document text
    • http://strandedtattoo.net/file/jilibekalatogexo.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f722ac3d6---foxibupegemoxuzoxuganox.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/95349997042.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/om7q1kqsadl2svucvv90uva7m9/mivazesi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacc992ce2---nelomarom.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/g23si3nq3pr6h92lhfcl7pojs6/60456597097.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d2421cf0e68---13642556919.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/feraparone.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/jivilezovujugupufeso.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161148e6f44c55---wasejawi.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/8f032c22fa741af041b1dd781efc1f71/xixawakeparotaduganat.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/jawul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sustainable+fashion+what%27s+next+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_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 11032 bytes
SHA-256: 7bde3ffd46fc0953fb0e4a1e9a0c875f34d0fa24238dc401d0a0a823adda1212
font_01_sfnt_off00011c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C15 18980 bytes
SHA-256: 0c0c916e9f4f5b3fd251f01739abc28b58ee4452cdba430d75302ce11b8c4a35
font_02_sfnt_off00014cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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