Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25896ab9123fefc…

MALICIOUS

PDF

95.1 KB Created: 2021-08-01 12:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2a35b049100bee0b0ee0171c6ff084ff SHA-1: 30a6aca2e9a3c4d2692b0848af61974aa89f088f SHA-256: a25896ab9123fefc5c9acea878ac96448e7d977072b9f80f55c3ba7319ec00b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This suggests a phishing campaign or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbedfcfbb8---69020923943.pdf In PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/oc9m2k2j2iqu43bmuvl364e227/nunanewuzogopijawajabug.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2b272e96b---57371872797.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/zifevefomakujixogek.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/42f0d3ae3ae4b34bbb38fe372c6c39cc/jedemukelebatiriziti.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0972500b4---mefaxurubupakepadetaj.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/tusejike.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5e60c9e23f9e39897cf743f23e57ecdf/88741129758.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/50b1bc18b47516357392e548ae79cca3/44884143688.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/76987446900.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61e6db1aa2---50406796979.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16102e8740d224---89370142332.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/nekunemikutigoxibuso.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/20489375006.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b65de808c---98925752737.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/40368932392.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdfa0a22c3---69805873035.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6888f8c767d7bc5a514f0bccea873891/wutimunokamisatekodo.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160771cc45b63b---bumumafu.pdfIn PDF document text
    • http://tkvolley.pl/upload/files/nujakenojuninelaw.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/7981561558.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd67c2334---tepitalakudu.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/85895188790.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/58891688116.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/lipifumuzunudakelo.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd010bdee0---88970277150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+i+charge+my+mophie+powerstation+usb+c+xxlPDF 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_off00010e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5B 17280 bytes
SHA-256: baae4184b7567ee2bc8c0b0e39b717324126464b7aac0033ecc4b6c7b73bbe77
font_01_sfnt_off00013bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBA 11492 bytes
SHA-256: f786e2f48659c00403172374ada2997d0899f32a4294b9d18cfbfb39da81498f
font_02_sfnt_off00015666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1