Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3aa642ef6015a4e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 15:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25cf246dc28b6ffd5f9611af7e6267f8 SHA-1: 3228713b3fa7400329d2580b80670904275793cf SHA-256: c3aa642ef6015a4e4752f8378f4b134c3a20a81db27ca76f395d4dc57c7c7b63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content or redirect users to phishing pages. The presence of external URIs and a link farm indicates a likely attempt to lure users into downloading additional malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0fec7d066---kudajexupadonakiwovod.pdf In PDF document text
    • http://surtek.biz/image/files/20150114_132521.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/zefesovowoz.pdfIn PDF document text
    • http://fgosvo.ru/files/files/tatetelemire.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/puduvalenesufodubudorosix.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/jaguzikalofekuragaxudew.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/98981769165.pdfIn PDF document text
    • http://axwelindia.com/uploads/92577719448.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/saxifojemomel.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/jilijulosituvepokos.pdfIn PDF document text
    • http://abwrva.com/uploads/files/86176169344.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/92242780937.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/98467026406.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d15f730545---temagoduputubesixenadamul.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cecebb572d3---mebokudewuwali.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1cbb2c483---rezige.pdfIn PDF document text
    • http://sciattella.net/images/file/85597772625.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/62228718179.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/dupofidupasowuto.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/30e3376d3ef6ae455d1b4601be220bfd/zigazagifibimizap.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b46a9e57b---juvupemupesuzuwula.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e64ad0ab64---fisazojerajexitomete.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14cfe2d7f1---61686167468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=free+pdf+editor+windows+nitroPDF 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_off0000dff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 17756 bytes
SHA-256: 31289168404aa6ace84d8b2c618776c1050a7c264525de909d165e69df842570
font_01_sfnt_off00010e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12623 10348 bytes
SHA-256: 03fa8943a2e5f06a0bb703b9fa5eb21e9e14bc9a7c331824665e77034b7ea97f

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