Malicious PDF — malware analysis report

Static analysis result for SHA-256 59dc9a9a94dc9897…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 07:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c67515bf5a9042406732f703684a7c68 SHA-1: a32edaf2feb5cff8b899e26da04683be6cf50cf1 SHA-256: 59dc9a9a94dc98976985e434810dfcda4ac1e353c7102a8eed45c17197a013f6
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9716

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://jyotiacademicpress.org/uploads/file/59358467156.pdf In PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/xupadobolejod.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62b71e70c5---7119423832.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/perosonenazunob.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210730200824.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/popofen.pdfIn PDF document text
    • https://cityface.cz/res/file/49822279023.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/71416059147.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/m9flivj8dle85uu5rqd832o0vu/53433400197.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/53246628850.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/zonosutodiwetanigaro.pdfIn PDF document text
    • http://special-pharma.com/upload/files/88300167401.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa72d975d7---15985566288.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/65140315710.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a41ce4cdacb---xozenalisitugosugotaf.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/93831580185.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/93674136541.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021072417022773499.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098f9734521e---90671659964.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/gofeleximutizep.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/vojot.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/80708911635.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/25658513131.pdfIn PDF document text
    • http://sksound.com/userfiles/file/12066066343.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1ab174a44---98329909303.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160823b511de79---zoxevun.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6571092873---wogawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=safety+manual+template+for+general+industryPDF 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://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_off0000df5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 17840 bytes
SHA-256: 48dd2591659e78453a7c44d5344ed44f5ed49c01f11913d51d5c5e3b0104623b
font_01_sfnt_off00010d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5D 11128 bytes
SHA-256: 333c0f63866bea1de424c601c14102bc49460da67966bd220176945fff93b6bb
font_02_sfnt_off00012719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1