Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcbbc39fbdc3cc0…

MALICIOUS

PDF

76.6 KB Created: 2021-09-19 13:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9c409b3317eb628a1ea305490e2a76d0 SHA-1: 697a00aa4beb1ba91ffa9e4a5fc2b261d3608c7a SHA-256: 4bcbbc39fbdc3cc00c9fbf7a653f30ecddd237238d4b4ea857cf82d7c5027bd8
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability to execute code. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms strongly supports the conclusion that the PDF's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://queure.ru/uplcv?utm_term=antena+tv+app+for+android PDF link annotation
    • https://alteanetworks.fr/img/file/74769770114.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146d59b13901---poluw.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/bfb4e8153ae734e04355e03c9c893fdc/1241487909.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/99201157069.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/31554713624.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161418f7830256---93828692730.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/tezamarasedasijakixad.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/29191252441.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/fuxutemitafasajifibu.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/dofajoda.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/44125410566.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/xalozezetekirimalamu.pdfIn PDF document text
    • http://bienbao.org/uploads/files/kogovizemodikot.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210919155053.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/xikafubegap.pdfIn PDF document text
    • http://retailcop.ca/files/24174663983.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/8e25d0891b6081328cc0f61bbfa08e49/gamox.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/bfpjsk3ho14920nmll83ru21js/77534163094.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/vawexom.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/0i4frfiejmj3fm0chglpn5jhg9/52405974183.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631514547.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/fobelakoboferamomuwuzefel.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_off0000c6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F8 18168 bytes
SHA-256: 655e5ded58f94adb27ad0fce14190406f1b18b1704a4a5853d87213ccf94b515
font_01_sfnt_off0000f598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 10324 bytes
SHA-256: ec191357f9e63e087c9a3ece03c746f23628273de1be7cf04b4f4c68b17b93d4