Malicious PDF — malware analysis report

Static analysis result for SHA-256 916f806988f03a74…

MALICIOUS

PDF

94.4 KB Created: 2021-06-28 20:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 552fdc01d8ff7cd07de78ac1222d6a33 SHA-1: 7bd7b63a610a2f0c42019ed151372340b2789a6c SHA-256: 916f806988f03a742f502084b38a034ebbeca3beab2d6c286f5b30b3e6d4d4f8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection for phishing and trojan activity. The document contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://medvor.ru/uplcv?utm_term=best+interview+answers
    • http://writtenmail.com/upload_images/file/kuxow.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/molafepipamor.pdf
    • https://weddingitaly.jp/images/file/lisudoluku.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f922c6df2f---degotogowogo.pdf
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/f3689f0cbc5f0ccbfb13e2d106fcc175/77837347079.pdf
    • https://ovalpolycoats.com/media/33541976853.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6abb5cb2---72658372498.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/0c487cf2826b79eec37f6f0f204c23b0/40380225794.pdf
    • https://digicpictures.com/downloads/joranop.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/0a7bb04df92ea4349d6e80b19c2366a5/nuvejopetuv.pdf
    • https://unosms.us/userfiles/file/xobep.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a89e85caf3fe02509ffa2606d7a90b01/jusofe.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160700f98d1df1---gerepibuxagolum.pdf
    • http://citra.cl/userfiles/file/kalubokabibi.pdf
    • http://podlahypilat.cz/admin/file/32757483015.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5b755d3345594e0c8c38d75e67545afb/satuzubetizurexadega.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709ee562529---54037514830.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/80945822394.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca1689edf---simezifadafutufexawetamom.pdf
    • https://planet-for-events.de/userfiles/file/71743196844.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160857df5a5e3a---28459606715.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/997337988b8332a8498aeedba2097465/90830259268.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/9ivouo0kqi2baiffi432tnm3bg/fudewinopaleg.pdf
    • http://ozona.pt/wysiwygfiles/file/52291870327.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e68.bin
f2d765a1ab358578537dd6ef5b0dcb2ae986bcdfe5465f0a39d0beca65a29344
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 18000 bytes
font_01_sfnt_off00013d86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D86 16792 bytes
font_02_sfnt_off0001559d.bin
730151a06f8e7310059c67131a3627f72a943dbd1ddd9e8e610be1fee9eb8958
pdf-font-stream PDF embedded font (sfnt) at offset 0x1559D 10140 bytes