Malicious PDF — malware analysis report

Static analysis result for SHA-256 42df11fc0bf61efd…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 09:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7e3aab030cd5555749a7ceae9b0d0c89 SHA-1: 8d386536f5d295b9a7f7c2a1ef171e285d6511c5 SHA-256: 42df11fc0bf61efd0de6f5be42019017e21da053f9161fd584cd7b67db980bd9
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to other PDFs hosted on compromised websites, suggesting a multi-stage attack. The primary goal appears to be directing users to malicious content through these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160eca0d97e86c---11047150500.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/d70e2a7f635cbb4dec223e06d02faa3b/56876358178.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/sematomitonatavo.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/dozokenonov.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19d6843352---solafepenow.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f47be3e1f6653e37144fc1c56626d33e/50808206973.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be24691273a---ruparusafiludorulapeja.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e1acac548---dijawamesafem.pdfIn PDF document text
    • http://wjcopy.com/upload/files/44142000154.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/duwawobagadun.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160817d717132e---kuzanumuwiguzivibag.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/20393093223.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/22d3d984c384cb7c5e3921afbf2d61ab/kiboxumovalelasiwetedaxo.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/putotibipevavu.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/zitafoxaletugaxu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aa5426891---gokis.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/sikojipavosisijodu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ddb8e349---68845229069.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610ea57a7162e---nijorizuvozikale.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/nuzifidetoxedapenok.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/jekifekajifijas.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/jorarezukabowom.pdfIn PDF document text
    • http://kelvista.lt/images/files/wusokixabaxeledifidofugem.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a694b5197eb---zukaravimowobivemepe.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/90539273476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=company+law+notes+for+llb+students+pdfPDF 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_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 17204 bytes
SHA-256: 84ce133abbd7041c9c2ff3f998de6762404ad670bc478e8d7243d67cc9a88816
font_01_sfnt_off000106c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED8 11036 bytes
SHA-256: c9eb11cedbd2715ea51bff10b89f014a4d69b68ab4f67ad80aa29374f8af1891

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