Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd6c7c83c960ea2…

MALICIOUS

PDF

101.8 KB Created: 2021-07-27 22:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24180ec9515003f880b4e0a115f054ca SHA-1: a57c83d435dd835ae32bcc0a9026e0aaa474b91f SHA-256: 6bd6c7c83c960ea20d80007e244987b9b1097ed077d192c99b43d5888c46e0b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to WordPress plugin upload directories, suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/f7ac45e05bb78136ab9f297e0f786203/25420925121.pdf In PDF document text
    • https://tannhatviet.vn/upload/files/85160596587.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0911bd23ae---mogigisaleruwapesoxowar.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/jivekebodedamedavemo.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/76244412326.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/e37733cc8823186aa0b63bf37974bd31/jozen.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d78c14e5f809577fc4963b1be74dab01/94710505793.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/166f9bbf41ec4bca273e77564116ba0e/87289079422.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gopezobelede.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/kenuzasitori.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/8ukehav8fao5b74acqdctd0q60/guzulewijujib.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/53cca19eb543c6fed3565aeab32f8eec/koxufofuna.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qdp8k7demftbea6tk6cgmd3hh8/fuzanilivivagumu.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/xidogexevagexowetigediwu.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5430ba4861---disufi.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9e5d907e5---mozubidutozugubafuriduf.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/2db53fd3ace4cdb27de2b598f590448e/18261661042.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/rowarixejota.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/nemifarofokamir.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/zobare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cuadernillo+de+actividades+para+ni%C3%B1os+con+tdah+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001282f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282F 11120 bytes
SHA-256: fb7e5b4bd5661f8ea9b7ff68b6dbffce8b9b8bd66269b850e18d99274987b401
font_02_sfnt_off000141d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D2 18428 bytes
SHA-256: 5f82b85e55f715a3eeeb8ecac35158a430f0a485b985896688fbff8fb14e764b
font_03_sfnt_off000170d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170D5 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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