Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aac20088a23e33f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 02:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c01c6586c70cba39916b2c00ba8aa3e4 SHA-1: 1d0514633f81f60483d62a364e132b9682f02122 SHA-256: 1aac20088a23e33f38f220ec0b61bbfedcfb2d7b3989daa363c9cfd634e37373
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These links appear to form a link farm, likely intended to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b1826a7a0---depapaba.pdf In PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161142838091ca---86555707150.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/noraxeda.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4fc6pfm95ccpaoner5rgl5igs6/sukatujawiworazuniduk.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0a1ee42c286f27cd42017637bd5e7d78/kixaresaguwefalezewavo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609415355b727---7173221237.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e003155d217---94682744031.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e123c383eb---malerapukibasag.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/49466935032.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eade8a7f52---51863181089.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/81986432967.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/juluxawapag.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/55240126156.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4260a942df---lukezupab.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607001e035e16---devagonune.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/88698430365.pdfIn PDF document text
    • http://massimoandyuethui.com/clients/69227/File/37170663038.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160905be4d635a---xazusavizekake.pdfIn PDF document text
    • http://wdnederland.nl/file/xunugamured.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/64487145700.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/sulapowibusaki.pdfIn PDF document text
    • http://dsrental.com/userData/board/file/29572155379.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/98123945635.pdfIn PDF document text
    • https://digireg.nu/upload/wawawupikibames.pdfIn PDF document text
    • http://msiutilities.biz/documents/dofizapusesupofoxukuvav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=jekyll+and+hyde+full+text+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_off0000dafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFA 10516 bytes
SHA-256: 28df3e5d5f4b39a7274441aeeb69706c74ea84ad1b33278fb73f265369b5f5d2
font_01_sfnt_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 18036 bytes
SHA-256: cbac9e05cd03990599852568e394cc768452045633cd879a7d4153601720fb49
font_02_sfnt_off0001214d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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