Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcbc1cffb4d18f4…

MALICIOUS

PDF

88.1 KB Created: 2021-09-02 00:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86aa6657519a32764b44fa7bdacdda3e SHA-1: 1c8c9b6c840ce00b419597b0933029df177f5cda SHA-256: 0bcbc1cffb4d18f4ea84bc0f6c7f19337f06e25fcea35cbd02c009c8499b26ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites and disposable domains. The presence of numerous external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest a phishing or malware distribution campaign. No scripts were extracted, but the document structure and URL patterns are indicative of a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cructi.ru/uplcv?utm_term=cookie+monster+letter+of+the+day+a PDF link annotation
    • http://bertoniamministrazione.it/bertoni/public/file/wodomise.pdfIn PDF document text
    • http://servmed.net/userfiles/file/72085681099.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117e7ae2ba76---48447657805.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a571e117f6d---40828137260.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/52238044076.pdfIn PDF document text
    • http://someteme.com/archivos/_20210830113147.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d64d16355---67892601057.pdfIn PDF document text
    • https://emmaushuis.org/pages/21922359310.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891ce3b0dcc---lefem.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5728c39139---gobodemumogejo.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d9eb4829f91---4589829568.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/nibevaxoranikojarit.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/a6li6g4pd29viv83u7eo4223c1/49680033742.pdfIn PDF document text
    • http://ubest.ru/images/file/7086930259.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/60c084a912e5d91dd8c3e5c52d22cb0d/laxatavunifasakewov.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f2c284798665eaaf0fbf85912b7fce6/nisowisajunoboxivipabugix.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081db75af189---87515740726.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/jiitbr7oiuhivggda181hdlkii/puwivizilizafetivoferego.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084dac0ae5b5---bupopudajidovu.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/15198877245.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb35924a53---piraxodepufopavix.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/lukotoluzodebij.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_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 17016 bytes
SHA-256: 3d4bb8be20ad9ed0bcc7dfe9113932457b86875d8c29ea397cfcacf93ced7c44
font_01_sfnt_off00012113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001392a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392A 10856 bytes
SHA-256: 36bc4b6df2cecddb9f4e2af9800464ec637a0c3020446b697bca2a4c149d9ce9

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