Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c56eb8d8dcb628…

MALICIOUS

PDF

84.5 KB Created: 2021-07-06 08:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 66f40496943c68a2fa1e7a1cf6f4cc4a SHA-1: b5e620ef8f2205c92c44c450cc20812dffdbd2a2 SHA-256: b0c56eb8d8dcb628ea4ee133884976d4e70e780cbaa7460dbcc8ed2ab38c6cdf
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, potentially for SEO manipulation or to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=magnetic+field+at+the+centre+of+hydrogen+like+atom PDF link annotation
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/3e84f2dd80112e1f55aa58665fba7e46/viximivugisatigarinitikuv.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/36818778871.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/t6qhkk8dffofakfaarvq2husl0/sunuxi.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/fowig.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/zusilobubizal.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/27273315906.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/32464533622.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2fe77f495---6914004298.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608588d519aa6---35943091577.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/wukidapejamuwowovoj.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdba717e5f---fijuwarogagugujalujujitip.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f63ae83698---26993445535.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/i8lq6dckofamu51s6b3hal2v00/luzomipulaz.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2cd676399---refew.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/1bebb66e0718253fa6ae0e91b8d005e6/pukuxofapudeledu.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/nujoduv.pdfIn PDF document text
    • http://praguetransfer.com/files/file/jigeb.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a0199d23d---resabulizoluruxaj.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/12554369514.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/bivivelomozekesowosoxu.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ffeac86dbdca3feaa20fed061b63e30c/76048847174.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bb63306af41---57841775469.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf8b41d700---kuzulilerakirodasarifazo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/82421bf57a1d972f1bcce298e1b0dd96/gazonijabofu.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_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 17940 bytes
SHA-256: bfcb272f61a108d91ef2c6327a0f229277001326b2c93ae2b1a9ecc621c128cb
font_01_sfnt_off0001133f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133F 10952 bytes
SHA-256: 23406aa14a044026490061d9ad07372011b1f42d46d08095f4204b48b8357f1b
font_02_sfnt_off00012c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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