Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5e3257f3d27765…

MALICIOUS

PDF

83.7 KB Created: 2021-08-25 09:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: f5bde36d7f55791df950510e03e16ed0 SHA-1: dc9f602a7fac86a78da844d235b97164a848f7cb SHA-256: 5f5e3257f3d2776559f7cfdeae477d348770a3136eb98f0e05acccf596f822f6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=allergic+chemosis+treatment PDF link annotation
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a39dcf24b63---nubuzeri.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/disesufobovinesuzi.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607925671803b---89764424881.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d089a7137f1---69894584505.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e4a56f5a---lazotizez.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/9962162520.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/17b82a7f4b5b4e3c80efb9ecca015ef4/filabevurasalebedibajo.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/7870152167.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/83235895091.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/u0eko6ntbdpjo6cj6i73luhqbn/fugapegi.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/riwezezinamek.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/89829826854.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61643718591.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd15eee7ff---zodalironevogevawuke.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/zokolilajusuzoraxideritab.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b38f982f1---dirivajixasebinamoziputa.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/livarifapobugozala.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/c2q7d7cfcg8k7enrslc32ck0en/zibebuvamuvesox.pdfIn PDF document text
    • http://jar-ted.pl/file/65965972012.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/51801550913.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/rurejiguwiluwapevavezere.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607126e770e62---37610336166.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bb32b2b86---xedodizoz.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/wujafe.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/xogukagubi.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_off0000e558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 16640 bytes
SHA-256: 400b2ed303bbf010a9162f97e626160f8592ca766853ca21addd97c24de92353
font_02_sfnt_off000128c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C0 10660 bytes
SHA-256: e65d768ab2c33c5a46fa871b68793b9e7d48fac42d99f6c67aadd80a87b3a99e

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