Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f637ec66fb107ad…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 17:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5943d4cfcbf673eeb611b18f81d7e4a4 SHA-1: 538c738fdad0ef663a7af060a9e442672372039a SHA-256: 1f637ec66fb107ad3e93b9ab48e45a212b5a1eab7b91cbad47b91ec6e2eb87e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF 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 embedded URLs pointing to compromised websites and potentially hosting further malicious content. The presence of multiple links on disposable hosting and compromised CMS upload storage suggests a phishing or content-distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/93854282135.pdf In PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160edff45ccfe9---98402385434.pdfIn PDF document text
    • http://domario.ru/userfiles/file/92131654832.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/47933915605.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b907c1e4a01---jokuw.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16114d9519b9bd---75754664855.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/gukobuvoroxite.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/21965584736.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/09e65f28fcf6c3a4524097fecdb4a25d/vivevamijurapogutizalaxo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/mapeniverujixofejorakof.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/lanopebobaxagud.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e5ea2c9d4---51649945697.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/pn8ifce95j4thp23aajse1utj7/fepobagaludar.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/judupuged.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/vuwilanasa.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/aa2776f3598962596b34681225bcc220/vuwebatowedik.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c476d51e270---65161632008.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/badugekenababotuvol.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/da1678a38962c1153355f996ea862137/21804586471.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/647njojsnftmv0o6iq409ih8jd/74605820435.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/vexobajubaxovu.pdfIn PDF document text
    • https://starbox.fr/img/files/91223491969.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/92416908883.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/sffopbcf84cc1vlejttlpcidq1/duzakodadufagisuxarek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=interesting+and+funny+questions+and+answersPDF 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_off0000d2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 10880 bytes
SHA-256: 13801d968a278cb4e9e378c6bcfd9563797ae08f94c9c3cb8e597d5683780652
font_02_sfnt_off000103f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F1 17196 bytes
SHA-256: e7970a990c26cb0f56b827b91c220aa670c48e407efa2b6ab84a43050add099e