Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e8d9f25c4b36b4…

MALICIOUS

PDF

85.7 KB Created: 2021-09-12 11:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eec4453e9e62b866d1ad0ef36d9c745c SHA-1: cff69aede8dbe01a327e09eb13766392ae965b2a SHA-256: a6e8d9f25c4b36b4995599bf450a0dcd27092ec7ee4f3c39402c3f5a458ce86c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload directories and disposable hosting sites, suggesting a phishing or malware distribution attempt. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cd72c55bf---39033854117.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac52e19fd---rezuduposa.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/zifanol.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7f138daf---98737962043.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/77499224101.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/87456216703.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/76cc60629ac7c7b9907170bd54146b6e/kitagudifitibewevarifow.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/38684845770.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/35506679804.pdfIn PDF document text
    • http://strandedtattoo.info/file/nigogewijijuravurala.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/8251168811.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/96458920885.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/67502392503.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/kabaz.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/66146549464.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dqg0rk7r81usm8b9u3780s21l3/fajakevisopukumel.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/zomofagagobamudaruwokesas.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/45393277906.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/p1inn5vagdsrkfjgbauq82hdqu/70067726620.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/wegudifotofusezovomu.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/rusivowegopa.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132521d4daae---18381945165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+format+android+phone+without+passwordPDF 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_off0000e85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 18252 bytes
SHA-256: f1c479063dac12c3b716f8056cc568a752be94c25cdb9fa50ecdef4e990cdd2b
font_01_sfnt_off000117a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBD 10896 bytes
SHA-256: f1f922d4087ad4db9193422829f97ec725d19e581c3cdeb006f2c6713fef8afe

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