Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6ee971bd01f04e…

MALICIOUS

PDF

113.6 KB Created: 2021-08-20 00:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b92af748be6545fd3a6a7bc53bf150d SHA-1: 82b30ecb1a0567b40c988ef86f73784dda2079fd SHA-256: 4a6ee971bd01f04e4481b4620e4e41beff15e104db98ee1c912e347560f9e48c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

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 http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/90865048267.pdf In PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/41318916793.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/335fc22b06bda6ea63cc07273002ebb4/21172716526.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb48f3797b2---53564212537.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da4dbcd4a8---jabogamitilebigama.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/65151910769.pdfIn PDF document text
    • https://onlinendttraining.com/files/xogiwugexogin.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/32956846911.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/47292848468.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/nituxabizax.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/75758311887.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1edb93bffd8e9163758ea3f111dc3646/jotamuduwusobu.pdfIn PDF document text
    • https://led7.ru/file/tafitilanofudadidizidi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161078c7e37b64---42143534318.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/24976398729.pdfIn PDF document text
    • http://poorclarescork.ie/images/46995238040.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/59201860564.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb3144b892---49576479491.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/nsvsoim0fm63at8p8qhcjlcq4a/sivowowutatapu.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/7f4llhde84dl9drpoh00binh0d/luxevifunotegibabotovo.pdfIn PDF document text
    • https://petek.biz/resimler/files/18023627184.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/oosmnf66feqo2ll57len3309ao/jovaro.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/27185458612.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/laraf.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ba67dc49bca8c60d8bd4bc6b7ccef422/nosenaw.pdfIn PDF document text
    • https://cakkue.com/contents//files/31065926201.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e1bf0036d---67628293073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+religions+are+mentioned+in+the+quranPDF 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_off000155e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E5 19676 bytes
SHA-256: c373c249f0f5824ab84fc3297cf0dd032a9fa8102463f1a25a3fed58777f82ea
font_01_sfnt_off0001865e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1865E 10936 bytes
SHA-256: dcd947223f44375bebe9ada552d92e18cc0f195c6ffa74cccb922741e4858d2f
font_02_sfnt_off00019f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1