Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4626b2e5828179a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 23:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57076e8a98bf8a7718c4bf8c455ce8af SHA-1: 8dcd06695d581bce5a725ba18f3a8a1042426854 SHA-256: f4626b2e5828179a2720b7698f7b8865faa45ee3902fbabebdd5b2b4b4481e88
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly executed, the structure and URL patterns align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://allytemp.ru/uplcv?utm_term=android+car+radio+apk PDF link annotation
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/maredibosonaxipomexuxoxab.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/jubejofedizutude.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613576a48ae13---suzatuxuluvurux.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/duwusejuj.pdfIn PDF document text
    • https://preciseenergygroup.com/media/zofibipezuxizudimado.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/25718694941.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/maxowifekabiti.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/18684277530.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/15175799678.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa21b5ea79---fokixowebuj.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/1380667777.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/xawozapezimovebamumali.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/xedomekavomoxovezofamoju.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luwugosaxuwelirovarizu.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/78156786160.pdfIn PDF document text
    • http://smogy.ru/files/files/resez.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/38627607249.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/33403091894.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/guraxuz.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/jelelujeboselaboxularo.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357d9676b40---69194985251.pdfIn PDF document text
    • http://boki.hu/editor_up/bobuvojawidexemes.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/nelasozilekexagojulit.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/32577390791.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_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 18012 bytes
SHA-256: 939cf7e89c038456df44263d194577c858ae4e76c303683980c708e2387c4ff5
font_01_sfnt_off000105c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C4 10136 bytes
SHA-256: 728cf8591ed9987a987f5f842e0e4fcc45982ed3a223b66c24937bcdd8d5c1e8
font_02_sfnt_off00011c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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