Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c67fdb6483cf33…

MALICIOUS

PDF

63.7 KB Created: 2021-09-21 23:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c78bad7b9c7c4173e309a946282c3d5b SHA-1: b6c520dd936fedd3e4ec92f1f8124f03b457d382 SHA-256: a5c67fdb6483cf33ffe89a084d9ca9ad455110d69950ba68a80d8f02d94e24b5
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and IP address literals pointing to potentially malicious domains and IP addresses, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9619

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://infrive.ru/uplcv?utm_term=vector+analysis+by+murray+spiegel+pdf PDF link annotation
    • http://restravel.ru/ckfinder/userfiles/files/dabukemilulebin.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5469121eb64a4816001c43a89670f5f8/betubanunavuwagizawopavik.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161312aca0ff0d---lejotaxidadubokazuramuwal.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/feluxus.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/70230612167.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/retuvotadomizomaxidiwid.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/jefiferisime.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/28745070402.pdfPDF link annotation
    • https://mobilpetrol.olajpark.hu/files/files/gavefovomaforaxen.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/rijaw.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/9134149496.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614795f098752---fivow.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/zewitogelexojisejen.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/74774495923.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109112027314518.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/medatugizilewifak.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/1433182808.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b54f3937f---gotavogosulifoki.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/dulakaz.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/38079428751.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD07 11284 bytes
SHA-256: acd7c22b73ccb1d1b0014d3e7a36efa582428dd5efd58da3d680f7376e89cbbf

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