Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b246ddaadccfd7…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 12:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: adee70567ca98a030f1149ce135fb43c SHA-1: 092c077b068424e6ef79e76ee8d294eadfe4a7b0 SHA-256: 50b246ddaadccfd75b785cc4c6aee1064e6dbd227653b7fdf193786add39badf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://telorgabus.com/contents/files/89288941477.pdf In PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/faigfn5c66hff7bpd7gdo3dmn3/wedarubiterimik.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ks22cqfeugtg5cnu8hkap555j1/gopigowupetemop.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e7b1e1bb8---7572405807.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/zovag.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/946cujj77v457tf0aj8jae6pn0/kadukawuwefojefa.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/pedozozojowoguge.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/fexizexatesofobir.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/65281078863.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/raguje.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/tutudawilego.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/zuxiripepavirej.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/7301884893.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/selufamenoxilow.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/dvrmpco05vvu87v21k56b9n37p/62143503322.pdfIn PDF document text
    • http://allasclub.com/campannas/file/30013090597.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zitijimido.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084f7d9cfd98---55631764557.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/7ea2af6181825f9a3a9cc705725eb98f/48677160432.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/pasodiwudugogifuwufuzaxak.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369a727ce54---monuruli.pdfIn PDF document text
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/nubuwavul.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/rebukopogikomitoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=dna+extraction+virtual+lab+worksheet+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_off0000c398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC398 16748 bytes
SHA-256: a05e861c14c50e2f97b3ef37e6648dc82e37828868ed73900bd82e2abf2429a2
font_01_sfnt_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 10916 bytes
SHA-256: e4b16a9496d4e9c205aac9f9cbde510da5d8fe017d22cd6b54ff596573cefd95