Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9f45abbad652d8…

MALICIOUS

PDF

84.6 KB Created: 2021-09-02 04:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 626458838a4a9c40876e235c9b90b0a1 SHA-1: aa9b758c4004e192c7b71557fa112073f4fd0013 SHA-256: 0a9f45abbad652d86ae868933b57a480941f3067378b9f011ba3c1c6397013a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4b406086e1ea80cebe814d103f8d5834/fazozilasitogamusawa.pdf In PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b81618f952---kemuzinuduxilazofejuzatu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28dfbc82a8---wikamurizis.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/18745975624.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/80519638659.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/87672286097.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b4e3f0155f719880c7509b77dd009df2/tepebowedatapedal.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/41928240839.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610956fcc95b0---sevanikopuvazakoranusaju.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12c17cf42d---revarisasewesinewo.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/wefulijanijegakad.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/sivawegonawe.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/rp33jt0g3ffk9tp1im6bvj58pt/medosavegupitojavurowomar.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/20700045130.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5139ba647f---resoberox.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c8d1a26d948ab35af802412d8ac537f4/varavabumexasuvakuv.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/dc8a6cfe318bdb2b76cb0e3b1f397b75/45031824604.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/zesutesekededule.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/lekezugewozirev.pdfIn PDF document text
    • http://concept-art.nl/app/webroot/files/userfiles/files/24122230524.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/2210532704.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/bojunupunuxojelidedop.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/97340732100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=inverse+sin+domain+and+rangePDF 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_off0000ddec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEC 10464 bytes
SHA-256: 4b9feca862432c22b3200686148c56b9688a5e8b383e0a392dffd208676896cc
font_01_sfnt_off0000f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D88 21004 bytes
SHA-256: 1982a09a9653c1f7a45fb4ccb122f0c3aff5415bb614a1f773fce61d7af23c8b

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