Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e860092c24974a…

MALICIOUS

PDF

103.8 KB Created: 2021-07-26 07:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 61e6f5b8cea6cfdd1daf85d555171156 SHA-1: 0ffb62e263a706e305e2e672c2588ba230159741 SHA-256: 03e860092c24974a4ebac9a01da4b8734c4b9b32e13c14ad29017a1b40851e96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Static analysis revealed numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ni3e58spdvo6dprfgnsecp2n0e/baxagapizi.pdf In PDF document text
    • https://zemiigori.com/uploads/file/kivuvadepazowovuboweja.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c19674c7df5---96474355331.pdfIn PDF document text
    • http://cga82.com/admin/File/9880695301.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e88e6d5d0---81324642500.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/daf39b407a2bedcb319eb5b387c84d77/rufopo.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/libuzev.pdfIn PDF document text
    • https://peterdegendt.be/file/45420455664.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/70179972756.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/mosezumivagogewobimoxewa.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/doginifim.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/vimisarukak.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e3c423bf0---votar.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098e0eb97138---77396255411.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075ef3470875---zobazizu.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/51589046151.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/f4d9c00cbdbe18529e51e213cb487ba0/zofowukuruzomer.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/xiduposuvinaj.pdfIn PDF document text
    • http://russia-ex.com/90481630.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/24435373266.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b03d1f113e5---kaselixadedowowumuwalele.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/99ab30732ccb8683c14ff461e2fa0c6f/sebasazizadepunavipusiz.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/87045849281.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4857f6e08310cc813227ff868bd33216/watonitifapomowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=is+paternity+leave+law+ukPDF 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_off00013326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13326 17164 bytes
SHA-256: 5a1492657d1890b3bb89bb7db3adc9218fdc3568eeee355f454864581b4ac468
font_01_sfnt_off00016005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16005 10532 bytes
SHA-256: de02fe33c367ef83732007e90adb1f5bdf01b22e86ba2c9dbb049d6f97512c49
font_02_sfnt_off0001783c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1783C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1