Malicious PDF — malware analysis report

Static analysis result for SHA-256 5554008f97d6bf32…

MALICIOUS

PDF

91.8 KB Created: 2021-07-22 06:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 68ebe524bb5c994cb482103800516b1a SHA-1: b964ee6e5b34c794e18479ff40fd2eb37397e89f SHA-256: 5554008f97d6bf32780ff28ffd3a5e37e3ccffca257555c3eaf0f17052920181
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggest it functions as a link farm to distribute further malicious content. The primary goal appears to be redirecting users through a chain of links, likely leading to malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mrbossamktown.com/uploads/files/75253205134.pdf In PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/6530f22a17a4ccd2c6aef270acab3fd1/xigikoluzugof.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66226ebabf---fofep.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/11035026356.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/barasozoberebegizulupu.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e2b494d71---kurebisol.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/zetijoketo.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/biradi.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfb2a4aa5d---51873898853.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a4362ecf00e---48954537505.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/98950712316.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f784b3a79---gizaxasuvosokap.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b92e7fd44---duzawe.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/7ad78a28c90cc4ed70bb641b030365f2/xevaku.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f6660dbaef90c24297ca32f152c15023/76623353756.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/63452800126.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c63200bbe---88017370567.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/fd071e4fd053eddc525d3a3536d1ccc6/69519418817.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/pubuzedud.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7a6aa870fc---wopekupozu.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a292a4e7a55ca08411d32bfca14deede/jurosumuwowiz.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/22367548d43131470c1ea2f7298abeb8/79910201139.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/losozadod.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/73036105436.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/1so4aq4s67qqe9sq0ld02mhvvr/tamid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=dog+love+captions+for+instagramPDF 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_off000101c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DB 10892 bytes
SHA-256: da060a5a71d38efb0d77edb2dfbe3eeec9fa9b7099a462891bf38f0d900d40c7
font_02_sfnt_off00013312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13312 17224 bytes
SHA-256: 9335548e4bc339083a8578b9e2658596be3c8b123c5caa1ab80ffe60494a8a82

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