Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23972d8d5e09010…

MALICIOUS

PDF

88.3 KB Created: 2021-07-17 17:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a285f075c05d48acae66826ad7ec35b2 SHA-1: 530347d37b728a0d9fb837534d74a84c293ac79f SHA-256: c23972d8d5e0901087bff09238475ff3c24ebc731697f64b816159095013bc76
176 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 high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of an IP address literal in one of the URIs further indicates a suspicious intent to bypass domain-based security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/dbe8kqo6kjja9ti88m60jtlkce/55000920268.pdf In PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f15cf0d41c8---21473922692.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/tazijipizodegudokeponono.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/57bed7dadcfa0faa44df3a2788978d0a/89123712486.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fe904e2c5be9d370ce8bd4a9dfd2f0bc/16253776844.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/35311020113.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/88455249556.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607744c218f2f---88721672432.pdfPDF link annotation
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87e0063a38---velipalafelatodigomeb.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/3af0264d10cec302a9bf9515d0aea8fe/36774097005.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/2d1qbqm6fgttfto855pu4vl9rv/13820087253.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/zuvavoko.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/dgh47a9itg4voirq2eib5bf883/80073643403.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/041f136cf50fb0d041b99651338fc316/35310334679.pdfIn PDF document text
    • https://w4house.eu/file/31162840870.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/11904933703.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/370842096.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/63444404425.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/kdakc3e15ui03l3s82sg6ppa5f/49630513387.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dda2831f0---fumugasujokimoja.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///59887523707.pdfIn PDF document text
    • https://medtek.vn/storage/file/23309700681.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/ee27d521d0cc2e721a7f1f662c32d1e6/56139666800.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e40a485ccf2b20e626aff8b91db32d11/megelap.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/19850493370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=spinach+artichoke+dip+with+fresh+spinachPDF 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_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 10924 bytes
SHA-256: a246b45e7c4e2279b0b73f3bdfe32072e57877247a63f4548a143d2320285f2b
font_01_sfnt_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B3 18384 bytes
SHA-256: de5888a927cc4d11c4f5aa7ac63fae4a36dd03eefd7ec478160f836116dec455

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