Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e93bf0c65535f1b…

MALICIOUS

PDF

87.8 KB Created: 2021-09-03 00:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4db5f6878b8109518b170cdfa44a2517 SHA-1: 5b61373f2e1ffdd3943b0ee220827f087392c447 SHA-256: 6e93bf0c65535f1b420087556dcb899cad4c2dc31a175f57b479da34d598668b
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/be2e47447ae7f1e5918a65a8e4285ec2/nokirolod.pdf In PDF document text
    • http://ji-tien.com/userfiles/file/2425492408.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c218616dd42---fuzomazilunalavika.pdfIn PDF document text
    • http://iwaandccareunion.com/clients/57137/File/buxopukiropenufelijipin.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/24423631262.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wobifewubunog.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/13682747854.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/tixujunalo.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/tabitubez.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7be6be155---36516940157.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/53ec53e2502daea3a08c716e362cbe20/90863719124.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/ponusofiwuki.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/dizesijobopuxafata.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb93ae7d0d2---79179107524.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/17812540661.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/zanimumamesez.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16095ad792f1e2---99766594193.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cd705fe88---fifagenodemizoxutiritujul.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/13158c506f21095a9a0ab2d8d5bb43ba/95811144537.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fffaaf361e0---mogatifelubolilega.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/54162200600.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/62939340310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=clemente+de+roma+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_off0000f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 18996 bytes
SHA-256: f6b5d9d58c21df5e9af4909cdf720800b533595a9f74107ba208a129c2df620c
font_01_sfnt_off00012258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12258 10432 bytes
SHA-256: 5bc5e80adf763c528411eb4ab4352efabcf20c94df98c095ad30fadce2789435
font_02_sfnt_off000139f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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