Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ad4d6c8e7e1f86…

MALICIOUS

PDF

79.9 KB Created: 2021-08-18 23:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 90b164e13cb1dc1bbfa0828718c73026 SHA-1: 8979ea91893066151193d1cd8d0bfcfcd8e6778a SHA-256: b6ad4d6c8e7e1f861e4ebecd3e37456e632c475cf5124dac253048c18f76a5d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to lure users to malicious sites. The presence of multiple external URIs and a link farm structure strongly suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://ivepe-elearning.gr/assets/UserFiles/mainHome/file/wolurekabewofelanezo.pdf In PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/dc8219d38fec3e264874e33cee3d31f7/laramakanigaxi.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/14065515538.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/81376cf8164f8171e209e52d43ecc081/82584177211.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/dulewo.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e3a08e1ef3e652cf1483d01debfea5de/16726916786.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202108161951491910.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdf9c82f92---bodumiwidepemu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608046cc67f59---65936828664.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/8651596194.pdfIn PDF document text
    • http://generaldistco.com/images/file/19605335667.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210724114354.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce070d7f5d---6234471056.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e58c46b53a4---domukurawu.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/luluda.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/2440397eb63fdd213d40c82d3afe48e2/revisovu.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/28610659005.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/5836144115.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609736ea4a48f---ginuwimedonuwebin.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606efcd388421---zepexujarovupidoxopidu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b18cd3cc08e---73977023828.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/56452476122.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/senutivibaligesubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=please+find+attached+letter+in+responsePDF 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_off0000d52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 17160 bytes
SHA-256: b6e471868be4e4e8c8994834c3aaccbce3c04d17ca0fb86e1c6d635213d83b9e
font_02_sfnt_off000119d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D9 10716 bytes
SHA-256: 68cc4996b91455e1348ad4f431039a4f087b0cdf0b5aae77ec861dc440603cf7