Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a46799e5284a944…

MALICIOUS

PDF

86.0 KB Created: 2021-09-20 21:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 570707372d5bb2f3efa8f9ff2e41826c SHA-1: c71795ce5ee07a2e9120ff043a2720d08e2dd127 SHA-256: 8a46799e5284a94445cb42c84610e89d9e1a9222750166391c607b1013a8f940
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics confirm this behavior, suggesting the document is designed to lure users to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://irlanc.ru/uplcv?utm_term=dragon+ball+z+season+1+episode+1+free PDF link annotation
    • http://rucodelniza.ru/userfiles/file/pejivununewate.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/bavakokesim.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/62863334538.pdfIn PDF document text
    • https://thepainter.asia/upload/files/368860894.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/pepawafuwejegovit.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/38299189117.pdfIn PDF document text
    • http://gyliver.ru/files/files/39977536767.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210918033827260240mc69n.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/31923344657.pdfIn PDF document text
    • http://chinalabware.ru/d/files/87485316908.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/zoboxagujijufuzudimixut.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/wenuwewejufida.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/xodutapo.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/gapizilusisuwifidokuwojo.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/tinubuwetutulujefuw.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/63223589305.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1612efec5a07b3---susiverozasirufonupabules.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351bfa2bc26---fexape.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/56041468531.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/nupoguboviv.pdfIn PDF document text
    • https://vpmemorial.net/images/file/podivodigolugoduvokad.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/h939o0onscac7u1vsrg2pdrc0s/munejudivonodawudekoxefu.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/lapifova.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/16356310350.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/sisuwuduj.pdfIn PDF document text
    • 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_off0000e276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 20884 bytes
SHA-256: 73258b264423a6e92d1089900bece11f6fe08a778414a2be5f7a90f1e307ba9c
font_01_sfnt_off00011944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001315b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315B 10828 bytes
SHA-256: 2a57f4253307ad27c036ba9354dcdf96f25bdccdd0cdc993fd7ca1022874b4d7

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