Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c346cd3f9ced6c6…

MALICIOUS

PDF

73.3 KB Created: 2021-09-06 21:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b03a9a5ff9e327efba640cf3a9c313cc SHA-1: 5eb56097105ebdce1981a2210016ea78be6cb908 SHA-256: 1c346cd3f9ced6c64a9ffe44845b5498ea5ef4c4975f1056a936306b9adfb900
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://akapacha.com/userfiles/file/raripokuferalobujet.pdf In PDF document text
    • http://ongnuocdenhat.com/upload/files/94655526618.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d6faee3797---1515720419.pdfIn PDF document text
    • http://ashioke.com/images/library/File/81912100931.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5b375b8e0---xupaxez.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/41027784094.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/24610762644.pdfIn PDF document text
    • http://holzbau-napetschnig.at/zedigakujavofigo.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/bujolu.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/2a9jfradu3704317ujdqpm4aas/40648313498.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/41112433653.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae13663eeba.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca024bf207b---94903804400.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/51105329677.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/82590393747.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160867acc6422a---kakareniba.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/37175809978.pdfIn PDF document text
    • http://oodow.cn/upload/file/210629035805868837f2woat2e6ssg.pdfIn PDF document text
    • http://canadanur.com/resimler/files/82302276878.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611be2ffb9fda---21520972544.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/15132592537.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/38004565530.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/rumuralumimokamow.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/5f5ac738d956f6565b85fcffc5e9d270/jimofemigopumexax.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/9t2d3o6su1qfk1uvtvtv0271n6/xejologisoduzuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=colouring+by+numbers+worksheetsPDF 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_off0000bcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDC 16228 bytes
SHA-256: dc9a0718c15a17bbe993f336a504c17025453708411e4f8c956b28669b177492
font_01_sfnt_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 10956 bytes
SHA-256: 26d423e4e8d627b7b59d3d080b8d8d59c3ba9f4b1647e0fc92e87eb8e3853e09
font_02_sfnt_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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