Malicious PDF — malware analysis report

Static analysis result for SHA-256 e589dab9f6b7d633…

MALICIOUS

PDF

74.2 KB Created: 2021-09-13 06:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 80626dce3604693c8061fa3847391a17 SHA-1: b992fb6ca0016a45db859ebf9c6a3cc40f426f7a SHA-256: e589dab9f6b7d633e1008dd7293ddb4415018ed939b1690e3acc6027d1714049
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier score of 0.995340 strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://laborke.ru/uplcv?utm_term=hex+to+decimal+c%23 PDF link annotation
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134149299156---tidupujibozamatibafoxuliv.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/6552494832.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/38695185678.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/10238176959.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/76529398473.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/69040035306.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/38738765748.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/48173573801.pdfIn PDF document text
    • http://rayanchem.com/d/files/rulisel.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96abcfe11---loxowosej.pdfIn PDF document text
    • https://red-adlay.com/upload/files/35530570915.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/zelobuvebozafad.pdfIn PDF document text
    • https://bdata.vn/upload/files/dulovivukazudozit.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/40125372806.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/jeterus.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jilamitakisewuwumibakaze.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/18486993565.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/86141013469.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137488b68f5d---61627786616.pdfIn PDF document text
    • https://miet.hu/kepek/10297862073.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e119b50a6d04230bcd6dba87d3252903/suxevupozapimobilekanar.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/nizadomukesobeviben.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/vobuxekewitopamumikar.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_off0000bd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD69 17996 bytes
SHA-256: a8baf219ac68f575d5f06bf859d1bd86b326d608e64f7dbf0d8ec7e0ccd35525
font_01_sfnt_off0000ecdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 10252 bytes
SHA-256: e9803f0f7691736e78777856505e60284d2eebcf5fad356398c053f80ce82972