Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c66420824e3a70…

MALICIOUS

PDF

94.4 KB Created: 2021-07-06 11:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c22ae1b25d8dd90109ac3c3d0d61592d SHA-1: da5417620a04d579fa221620796d032a36b431ae SHA-256: 41c66420824e3a709a59d202d85bfddbef9aba88801cbe19a2cfdc748a985693
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites hosting PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b05ed127cba---49900888788.pdf In PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/589f7f2a873d056a0fa5ff566a871573/45393524512.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/e0aafebec6dac6c3e65a4b5f58fb1d98/3965366800.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/90816461361.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0315a94c42---wojipewurasukuzi.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8f36920d7c17fee290f7190d184775aa/xededow.pdfIn PDF document text
    • http://abnicum.com/files/file/fevogoviwaguvudufivige.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b082ffc9---20000543056.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607026a2958da---36747606473.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/66193060298.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160773c05eac43---limipilirukireberemin.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/waxenorizuje.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/seserorudurevem.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/78578197236.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/39650726387.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/bewepomizebosiwafotisa.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/94351782508.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab78a7bff6d---96985686010.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607285fcdd350---29992864928.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/1238703195.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a9945833e2b---50235844439.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2d35c28d1c29c3a2dc2b58dbfded429d/38358273864.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08e06f08b---33788664098.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dc054bbfc---71003959525.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098a857b995f---87162116653.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608587b60f0f6---fopugasakiru.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ab79c4d7327684bdf3d3d0e347b00767/zipatixefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=mk+chaotic+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 10240 bytes
SHA-256: d998638ddc381e0ad44899b3d9213939032b11bafe58692e0fa8b5f72a0259fd
font_01_sfnt_off00010e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 17440 bytes
SHA-256: cfa11c0fee58cc487bb29a1290e35ebc73c48ec2cfabae3383c19fa0ae59bdfc
font_02_sfnt_off00013ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000153b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B1 16852 bytes
SHA-256: c242435b10d078b65db30421601d735ddf0a070286b8d1d73062c4b6633f9a28

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