Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c81033fd562bb9…

MALICIOUS

PDF

74.2 KB Created: 2021-09-03 08:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: edefae40c873521faed3d0723241b7e9 SHA-1: 233cdf6bdd9afbd52289a134e2cb61858033081d SHA-256: 72c81033fd562bb9caa2c763cbfa46db95493bab1e31ab7b222cff5ce25950c0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting, suggesting it is used to redirect users to phishing or malware download sites. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=microsoft+excel+calculation+tutorial+pdf PDF link annotation
    • https://kisikana.hr/UserFiles/files/womepepopawetu.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36412025929.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/ranasaweko.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609834cd9a2b7---93857009415.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7cec97b79---busajidawu.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096767c77e74---62504507466.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612abc435d8a2---bukugat.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/864905891.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/81m5nb1dmbh67ikv9j02676fn4/33659756646.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/36445733796.pdfIn PDF document text
    • https://ebooksweb.net/files/file/gulotonogetabexik.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/burevabokedan.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/66263105082.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/54601242577.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/fatulajezo.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/45276377888.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e628b548c---tinezuzebimukusubazuges.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/dasukesipeker.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16080d74c26673---83304244967.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7581ecec91c381d60c6c28b8ff771ae6/12184557020.pdfIn PDF document text
    • http://www.heksan.com.pl/file/defojuxedifexenex.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/154b59d7876610b6d70a1852de236f25/nexutopijalape.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8abce8e6c7---niwekadagugivevo.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/33478216062.pdfIn PDF document text
    • 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_off0000c06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06A 10808 bytes
SHA-256: 3acd7e797feae2094c1cbf1148b05cd3df824986653613706a9ba2bcf45ae5d3
font_01_sfnt_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 16528 bytes
SHA-256: 6b0a26ba7cb38002892dd09670877cd6f6d89d299b92c79185773bc7628a8755
font_02_sfnt_off0001030e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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