Malicious PDF — malware analysis report

Static analysis result for SHA-256 84668af63a5ba56a…

MALICIOUS

PDF

74.9 KB Created: 2021-09-17 19:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d6543f48094ffaa558ae9041cbc11f9e SHA-1: 81e99f3edee5897d5b2236ed7c06907de07c2ca1 SHA-256: 84668af63a5ba56ac878c2a62e98cc2138826cea45a2a54664a739e69b6a0626
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using external links for malicious purposes, likely to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://medvor.ru/uplcv?utm_term=sd+card+not+working+in+phone PDF link annotation
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f8cd2040a---47171505064.pdfIn PDF document text
    • https://baongochoa.com/upload/file/17818558096.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/51558627519.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/24096268902.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/79197016180.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/41713241319.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/68407285116.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/nujebubipokirawew.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/11047579951.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613df5f3d8f5d---45257463867.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/98135226169.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/24034242232.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/65730821864.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/wemuse.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/fibofojedozu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139acecd7233---refupumuluwajapogor.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/70646224378.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/geniginitatiw.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/fuxozokogifogipovomolere.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/57832323236.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/zaxawifetekibafidu.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109111414548122.pdfIn PDF document text
    • http://grimastone.ru/files/83345319545.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f11b08e7b---wonapog.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/62396986098.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/27470109684.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_off0000c204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 16636 bytes
SHA-256: 67b1ea6b76016fa4aad6b450f1c42332df9e302c2421c4c0c05f99acae55c55c
font_02_sfnt_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 10832 bytes
SHA-256: 56060144ccc97db25bab293dcf76cda41b9ee5485393d5e92be9ef27e20f6a5a

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