Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4853c084f49d482…

MALICIOUS

PDF

100.9 KB Created: 2021-06-27 22:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4caeb2a21e0be610b397a58c9d1ba396 SHA-1: 3cd701c0170cb3b07e4c840c952347ebe5bf3558 SHA-256: e4853c084f49d482487281d701ddda20884b7c6f3a70e402a0c82573a78d50dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous external URIs pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

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://coretry.ru/uplcv?utm_term=another+word+for+racy PDF link annotation
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edfc676633---83974531551.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/letavudewitezowisavuje.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/55758363671.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072f72b4de52---nibejuwovenufafademetol.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a154a12d829---mitugakuwizajodinilore.pdfIn PDF document text
    • https://amblamy.ee/upload/file/97275098568.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc7a106de---62213894335.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/52772250a5ba7285213910dcbbddf754/xafajatideze.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/79d11625cfe5eba6ec69994d857a1c54/logovowep.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/19484225983.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/5f5ac738d956f6565b85fcffc5e9d270/jimofemigopumexax.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/8fa7cb9b731362eed9a625e7b2e0265e/44554390827.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/pinaxawot.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/fuzijejivofo.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/67128414979.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/nujutefegotudezunepemaxo.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/jupev.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/loliranoxebonalekejoger.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084b9bdd8309---41874878916.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/228413f7fdd7144b5b5223f2c63143be/nadezo.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/p6ts286mpanq4slhd7imoo3e9r/damiv.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eceb5d9c9a---luxakafesujenefuzilo.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac219586e5---24308565210.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/14171051951.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001430d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1430D 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000f1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 23532 bytes
SHA-256: 1d21b3ff152f2585d7bf7b9135a655742d2842b469281a2369d90461d1cdb841
font_01_sfnt_off00012afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000160af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160AF 10448 bytes
SHA-256: 4742ac25670f033c873edba3275073238cbdf027e7d6bafd54e78607b68338da
font_04_sfnt_off0001786b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1786B 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff

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