Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fcd37e93a40a72…

MALICIOUS

PDF

75.7 KB Created: 2021-07-14 04:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0dbe49aa889b6a1294e3530188901293 SHA-1: 58d5077b99ac30baf83793345ebca4150629639a SHA-256: a3fcd37e93a40a728422e4619eb6c06b6e33c361af7d9caa11fa376ebe99c715
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/6e17129425ee6c6733dcd948a4087d3e/88516349819.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/43012332371.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/47493ba8b1e11552ca79c2f29b2f4713/kowepeda.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/57909640018.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ck9f9fvid2eo12e9cssfjh97c5/43863780613.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/e84f83782b4548d3ea26c9418791d46f/rabefedidigobaretojajoda.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/87039606500.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cf61d8d9816---51884520651.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb78fbb0c8---84347338066.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e9032288668---wawanadexo.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/kevod.pdfIn PDF document text
    • https://2acontractor.it/images/file/56124617897.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/76880653381.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a165897a596---31205461396.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/velezigifaxogopel.pdfIn PDF document text
    • http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/35899924523.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/64059599106.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/47478800590.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/bezogur.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/676bc2e1df1db99c916510dbd39c8859/1281665081.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821197c36a2---kiwiki.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793991e4862---fujiwuz.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/ruwinevejid.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/rijasawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=happy+tails+groomingPDF 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_off0000c6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B5 10568 bytes
SHA-256: 02b670f45782aa3807fe7625c706a73fc91e26f9706f3fa2545b96933d3520b4
font_01_sfnt_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 16484 bytes
SHA-256: b8b381ec42d5805bf75e606d58e231709b05bbe57d903318dcdf03c960bacf5a
font_02_sfnt_off000109b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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