Malicious PDF — malware analysis report

Static analysis result for SHA-256 d101abb0b5774a0f…

MALICIOUS

PDF

74.6 KB Created: 2021-09-02 23:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 324a6a43cb90f13fa037d6dee13f7f16 SHA-1: b36e3d22472382f04d2d44db456e2e12a8ef8a75 SHA-256: d101abb0b5774a0f0ffa20d5d02c175d6a7f84b4dc6a8b4595925009086be011
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm. The presence of a 'utm_term' parameter in one of the URLs indicates a potential phishing or SEO manipulation attempt to drive traffic to specific content. No scripts were extracted, but the overall structure and URL patterns strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=minna+no+nihongo+pdf+answers PDF link annotation
    • http://totoumi.jp/upload/file/wevotuzikevotajuragipotuf.pdfIn PDF document text
    • https://susta.vn/userfiles/file/gupozelonesutibev.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/denekogudev.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/250cce0c0d5d6784849e1e2bd8d8c11b/31006291185.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0846f160061f4f6d3f83c32e50ee1c37/3440906566.pdfIn PDF document text
    • https://somogyplusz.hu/files/4949997184.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ha0qcvp0u6590qkt7akbairnu3/lawurodixokugawituvidel.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/60357459247.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/122762544060a27a2ed8592.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/vajuvisuva.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/bexeporonisexamulaposemo.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/25550496383.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/kubivizetonegopudovatina.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/86974781032.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/f0e437c2e3fe7458ad6cb6f8bffcab83/55050106071.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8727d37838---zofabi.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/tadukili.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/56884028150.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8b410618b---wozef.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c196c3dcc---xefakoloropetazonamin.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/bufawaxen.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/88035224269.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/66fdae201262c52cf861a3ce3f481e08/jetarorunaganirugulukuja.pdfIn PDF document text
    • http://atya.eu/files/file/16581695297.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_off0000b6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0E 20900 bytes
SHA-256: c1ba31e2fa261ece627dce05e4e695c671e673807f519ac6462a74eeeb3419ee
font_02_sfnt_off000104b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B8 10712 bytes
SHA-256: bbeb61b425989d58dcc39b3e0c2db71f7a4c10de71152b4d27bc6fd24b2bf787

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