Malicious PDF — malware analysis report

Static analysis result for SHA-256 8410188aa8aefd93…

MALICIOUS

PDF

77.5 KB Created: 2021-09-23 15:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf114bb78b7c12fd68fcf507cf570a9a SHA-1: fdf4b772494ac0e2ab92229f327e49ef088189cf SHA-256: 8410188aa8aefd93b2de2e17c73ceea2c7f7c5300890f7b2462296fa2198445c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a callback phishing or tech-support scam. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing lure designed to trick users into initiating contact via phone.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://laborke.ru/uplcv?utm_term=space+simulator+mod PDF link annotation
    • http://thanhlapcongtykiengiang.com/upload/ck/files/vomagexame.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/67778361655.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/41521943950.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/vujadatewulafe.pdfIn PDF document text
    • http://simonide.org/userfiles/file/32205167580.pdfIn PDF document text
    • http://slsnn.ru/content/files/49447568798.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/lesuvebob.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/liputagatipumuzufuxufopul.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161438895984d6---30469649992.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/52956597984.pdfIn PDF document text
    • https://wrd13.com/force/file/23157859873.pdfIn PDF document text
    • http://cutskytools.com/d/files/denobororizeridu.pdfIn PDF document text
    • http://fitviewer.de/files/file/51985070179.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/61781312540.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/xabulusojoxizezofufawuso.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/83906294388.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/89150877746.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/vd3avvo3rrin6q96jht2hkjc09/91485434377.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6a610bf97---jafavoramefexapomugezured.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/81839425742.pdfIn PDF document text
    • http://kngsm.in/userfiles/file/65677458259.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/nosadut.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/2773354577.pdfIn PDF document text
    • http://mobiliteit.nu/files/gijujemeni.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/653d615dfe7a29a56159e829aa54a216/66797879909.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/94525878328.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_off0000ca8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8B 17356 bytes
SHA-256: 2aa5027c920a0671beb6fa0fc4e3feba5eb254df4a6e67bebb4433a77aef1bd2
font_01_sfnt_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 10748 bytes
SHA-256: 197846d8ad7208dc5f9ff103939dfb7c4a1b51ef3571874af4a4d7240411745b

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