Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d3eef01a0a0d76…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 07:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1f7cff7ef0324d906f60afce5ca69f47 SHA-1: 2482dba326e744dcc6fbd5bbed5f51e1f323a68d SHA-256: c5d3eef01a0a0d76730e6210bba4bbc1c9cfc01d0d370e7cd9dddeb3fbe741cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external sites, some of which are hosted on compromised WordPress installations or disposable domains. The presence of these links suggests an attempt to lure users to malicious websites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://supermagnum-bg.com/userfiles/file/fepixetexe.pdf In PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080aba838ea1---4471536385.pdfIn PDF document text
    • http://peoriamayorprayerevent.com/clients/1/16/166e3f524b51ec168ebfd48f86188a1d/File/34998111908.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210815120523_k4yc6d.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8bb2d6aabe5e968b143971b3aecf318e/jewatesawalelikitexifoke.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ce9283915c339b15b4f6a9bdeeb42cc3/tomasidil.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/25212783172.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/nivubunibamujal.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160909f775839e---bitulut.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/ad131fbd4955f60384e7417e7d14de3c/fugolowudunumitoxidoxalub.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210703180306_1503424371.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/fisepabez.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/fc42cf6dcb1d9cbb6a43023dac4eb565/belokiguzukabut.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/bejepulilibiwikivunesu.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/66828768949.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/50943112534.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/8565155726.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/saputuxazilopoxok.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/niwemupexotibufiwafuva.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf93884d7c7---wowasewovidumudosufe.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/83905052466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fungal+infection+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_off0000d900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF112 17392 bytes
SHA-256: 9b39dbdb7b2efd39f18e9d9e0062c3b66f671faa23f9f67c5a7809bdc0f8cc41
font_02_sfnt_off00011dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFE 10604 bytes
SHA-256: a7f6a769a95c2c561ef608ab47bda5a6a4a0ab2f5119837dece0b97c39b95629

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