Malicious PDF — malware analysis report

Static analysis result for SHA-256 673338e657588613…

MALICIOUS

PDF

95.9 KB Created: 2021-10-06 09:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4cc49c7a7d520246b966f82db48c046e SHA-1: 7415edd35d774f2856e576f95c97c8a38011a0c7 SHA-256: 673338e657588613eff5d510acaf061a1dffd305b7fda7b0212a3f29618d4733
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. The embedded JavaScript is likely used to redirect the user to malicious sites, potentially for phishing or to download further payloads. The use of compromised CMS upload storage and disposable hosting for link farms suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=mayberry+trading+post PDF link annotation
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec845ccc96---mibiluguwejodiwuvo.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16149d5cb84c8e---jazavokikej.pdfIn PDF document text
    • http://scpt.it/userfiles/files/49755229992.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/89306596889.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/3540070875.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/tujamideretaxulo.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/zuzevekazawilen.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/nigekenewiwerukovo.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/fagoj.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/av258203b7vj46f8tbm6d4jhma/15411553066.pdfIn PDF document text
    • http://asid.rw/userfiles/file/21460491997.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/4use3ahmcr6b8fgggtlus3r6fo/9982484908.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/26719333035.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/bodofokevuvu.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/71976311593.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/medubajobuzudixesuwisoxa.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/xifuzonutudaxadazebopefe.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/sfo1sfgm1eje5ujghfn7sobdjc/12643617995.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/17110913652.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/33081255989.pdfIn PDF document text
    • http://starma.pl/files/file/65120276209.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a24ad25be9---86662300060.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109100822577203.pdfIn PDF document text
    • http://inica.org/files/file///16736967819.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_off00010e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0B 19884 bytes
SHA-256: 283105d8f9294356b55573cab4239c5f284227c250d5ee7a746f5f8fc446259a
font_01_sfnt_off0001418b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1418B 10768 bytes
SHA-256: 580ee84e13f48dfcac325df1de00d8348ddbbeee879a61f0c85c0fd71ef29727
font_02_sfnt_off00015a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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