Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a547e1497b94ff…

MALICIOUS

PDF

86.6 KB Created: 2021-06-26 15:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 512ab1cf08afc318834f2e9a3d3d9b9b SHA-1: d7f8f824c346c6447a5277f113c864d2b78e2ad6 SHA-256: c4a547e1497b94ff762d7478120992af3473a245a575cfd6708e7983b4206373
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier strongly indicates maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised WordPress upload storage and disposable hosting. The document contains numerous embedded URLs, many of which lead to potentially malicious content or phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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=difference+between+gymnosperms+and+angiosperms+in+tabular+form PDF link annotation
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/0ef82a50f13b4613b331e30b0d562d6e/tasitelinaruwupabowizenut.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f9a5c7bf---mikazatipikudegiti.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c696757c30a---kiromusid.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44b56965b---koxiwesinibo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a8c8d54736616949388aef297b1a8e19/numosutuzuforadofuner.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/6f4052d04285b36475b609b53620343a/77216440185.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280059088615.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61788279822.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9646fd7ca4ee226b64bba7dfbf22aab9/biberomoxi.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081abd70fe23---risiwikanilapebamo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607885ac56a09---jazalojofevalopidu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27ea9f2881---xifudizadune.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160add365746b2---80422738696.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/lelolukinu.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e17acd9c6f7630e8463fffcd8eba36e0/84383765004.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/zavodokakekev.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/kkc97h3eoc2t4csi1qg9pjnv43/jegosizu.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/cc48a24671ea2d2ab5928a9bdd1eb8df/11258029291.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/jutazusadiwovadomojin.pdfIn PDF document text
    • http://93564497.com/userfiles/12037711292.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/738427002.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0bafa7a24303eea2ff04229e90dc3045/nutoxijin.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/3tiqn99pdat9q6mcmnuj24cnb4/80513252478.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_off0000ee1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1C 11404 bytes
SHA-256: d6e9ea4700033f63fde852b252bf3839f7bdc847f84ca09123b0cfa4093122f8
font_01_sfnt_off000108ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AE 16976 bytes
SHA-256: 1f718302591afa03049a00f68b3c8de4d90050ead35c695b674da789d543687a
font_02_sfnt_off000134bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1