Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1b77ee82766f83…

MALICIOUS

PDF

76.3 KB Created: 2021-09-02 08:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 744a570697a39824485fbe7cbe553135 SHA-1: 9bde3095ea8f0b24166d899b3b86fdef5376487c SHA-256: 2b1b77ee82766f830c8e70e96ed9c45ae2678b7c590fd6a4162498aad344650e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to manipulate search results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7a813285---jagige.pdf In PDF document text
    • http://mdsalon.ru/img/lib/file/14307034422.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/61kgbjjnitil5unfpocn2eot99/ximaxasabizegugumavar.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a1268252c289705a2728c904c3769468/89478304627.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160983c31ece10---zowub.pdfIn PDF document text
    • http://punaide.com/userfiles/files/99007392143.pdfIn PDF document text
    • https://maturana.cl/upload/file/nilezijebagaxiwivaxet.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1a5e7eab6---gujigigowas.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/52259136913.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c2f3889ac25a59b39850f23c5fbcf8dd/749020465.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb8a8818be---romujuvutisirovaretiser.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109020943148539.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/lufadipotivixi.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/wusaxafiba.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea5627e5ba---79032892223.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cd63d3455b45731d0e2d0dc6aa9018b0/judoja.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/zojulebuguw.pdfIn PDF document text
    • http://fitviewer.biz/files/file/gukorezexibuxifunasevavet.pdfIn PDF document text
    • http://llux.vn/uploads/files/62900886344.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/51e65049691d4cd33c4bd2ba38d4db21/88618528717.pdfIn PDF document text
    • http://highdesertrent.com/newsite//images/uploads/file/femekabuzajurumovawa.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/abc57f475fc551b4e55f629f7d5d6445/51574319666.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210807_035334.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16085b0eb62384---wozilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=types+of+informative+speakingPDF 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_off0000c666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC666 16656 bytes
SHA-256: 3c566450bb60833fcc3f35c4c609229191237151b34ff2f750c78e5cc840964a
font_01_sfnt_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10977 10892 bytes
SHA-256: 6449dc86734d6793ab286f573fefdcc6a673b980296967dfa154347658fc77ef

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