Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b39830312d0b44…

MALICIOUS

PDF

88.9 KB Created: 2021-08-16 03:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab49849498284dc6e52513f3cc03304e SHA-1: 1b82d1b070bbcabf8ffb4120f738b5325f018bd1 SHA-256: 89b39830312d0b4415360c021b69f2ceaa744db0850cddddeda6cd5677e76e1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://drafthe.ru/uplcv?utm_term=ejercicios+resueltos+de+regla+de+tres+simple+directa+pdf PDF link annotation
    • https://alihuata.com/userfiles/file/xomasipote.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/gitujitoxesulatifuwakome.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/e2bf2b413f233e90cdb06386e634fe21/59488381818.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/f851ae78966349cd4ecacd589f453e7d/vutibefinusobusuvufivore.pdfIn PDF document text
    • http://merwepizza.com/upload/file/68202530081.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c97bbb99---balis.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429071659695153.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/pexinorosi.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/52269676609.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/pojijemux.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/3a07fe4e2be4d0057fb0c9aed8cd0554/taramevelusesu.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/f7cfeb38900d6d339a5994a844f3cc97/lopexemorasevatut.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/92209219041.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/224cce00bfed59025a7b2edd72ebc363/66447103031.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/gipojekezomewometo.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8cbc2f668---nefigepedefitedusiwega.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/36208693417.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/61295762404.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d451401c1d1f6be1906b411b0cacbf10/xaromexuladujipu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2334bf78c---kigebekuve.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/ziporonef.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8ae69b118874cae910b8160dc0f869c9/7647702179.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd629815d---vivefufeburutizuzofoz.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072723e6583d---30027407823.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_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D41 17272 bytes
SHA-256: 06e098c7ced611b8b495368ede33fb9eb2d80203799b1d79848e745e4d25e2cb
font_02_sfnt_off0001389c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389C 11072 bytes
SHA-256: 5b22062f600211a3a2088158c43e10571a41979171941061d77ab8e13ef5a59e

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