Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba0827d5145bcff…

MALICIOUS

PDF

71.4 KB Created: 2021-09-01 03:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0abbe15ad328cc20b0937123dd6b71a2 SHA-1: 92d499c12e4b916dcb4f9b467c4e829609251150 SHA-256: dba0827d5145bcffcaf48d3d4c2ddcd37005f9ead16a0efd7e5246a10de7726a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic firings and numerous external links are sufficient evidence of a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://residenciasanamaro.es/userfiles/files/29479611132.pdf In PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/lenagutadevax.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/62f39b7d18c581a48f357d7d35f1200e/71319222310.pdfIn PDF document text
    • https://ddms.tw/upload/ckfinder_temp/files/20210702132926.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/46657938608.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/larubavasajumofakagon.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/24884617184.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/41803352257.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/873a9e72e168e4aef2102de83d0fbf64/84978410981.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/17034306132.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/fed4ca146aeee9b44b7f6d02a56e0ba3/87323700092.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/6ae49dbec9b4298f74f6b020bb8f429a/mefopativebimufibopowa.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/tadifidezivirewik.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160713366c706a---78392819069.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0a63cd88fd5cde24dea94811624583a0/risugofaneximoziw.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161000d732e2e1---95072098615.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/19412111176.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/45331053293.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/82806495312.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/podera.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/94793107142.pdfIn PDF document text
    • https://bio86.net/fichiers/funotu.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd9a270dcd---voremeze.pdfIn PDF document text
    • https://ismart99.net/upload/files/48952046821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=program+to+find+second+largest+number+in+an+array+in+cPDF 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_off0000b946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB946 11176 bytes
SHA-256: d62ceea265957f7720b0177ec344aadaab7de1744cf841a562ac64091d9554c5
font_01_sfnt_off0000d33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4D 14232 bytes
SHA-256: 69884c458d2f79532e859b8440cb1979e956891e130a3db4e8e57f00851e0b94

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