Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50190a8240fbd56…

MALICIOUS

PDF

74.3 KB Created: 2021-08-29 12:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c609af20c73a9b96e58f986abb68c98e SHA-1: b105e613720b8c5e0fc9b107ed2282375f2310ed SHA-256: e50190a8240fbd56dc39deb0ee56323e1b97658e9bc49a0722347eb1cc0dae6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to compromised websites, many of which host other PDFs. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detection confirms it is a Pdf.Phishing.Trojan. The ML classifier also flagged it as malicious. The primary function appears to be directing users to malicious content hosted on compromised WordPress sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1dc446535---perirefu.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e64c2f24093---20463637514.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/sikurekudititabotulowo.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/50b6c29c42f8c75aa1d8804dade11c41/gipigobaxulew.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/xigegemopusud.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/jawul.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/nakejok.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/pogesosoni.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/bc344dfa1a0fe1d706ca1bbe5758cdac/tofuvumukewux.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/lovufuwugalutivadi.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/24615203248.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb98b071096---basumotajotetalovo.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/12846346702.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/pimifupiz.pdfIn PDF document text
    • https://abeess.com/userfiles/file/12396399163.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611c37a3113a3---vijixeku.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210703_C32C7EDFEA5468AB.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/83043047445.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/1896285499.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/b4gi3ba63o961c3il3nq959cf0/totezopukevutezubivasinab.pdfIn PDF document text
    • http://capital96.com/userfiles/file/5212272180.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/mnadlu2c8kv1fi8pv8fth58l1j/12161696662.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/1c61okkdl6tdoc5644572m6tvd/xogeg.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/90181032728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=introduction+to+modern+economic+growth+solutions+manual+pdfPDF 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_off0000bede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDE 11204 bytes
SHA-256: 0e24f612628c018360c4477f5433b8fa32fba3441e603eb5c81f1752a4803a29
font_01_sfnt_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 15980 bytes
SHA-256: 6bfda143c0def49102f7920838980fa1207556fc6dae3677f1f8d8e3806d25e5
font_02_sfnt_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.