Malicious PDF — malware analysis report

Static analysis result for SHA-256 7233e6b1e7620647…

MALICIOUS

PDF

80.8 KB Created: 2021-09-23 12:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cf22e43cceedf134f556692dce3801bb SHA-1: 3111fa8bf53fa37758e6fc4ecfccf7e400207f61 SHA-256: 7233e6b1e76206479ad59d290d77356b53c1558d05ad7b92f5df442095debd74
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=beauty+idol+mod+apk PDF link annotation
    • http://steinbach.casawell.tw/userfiles/file/48289036622.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/30653164210.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/68644629218.pdfIn PDF document text
    • https://ptogel2.com/contents/files/86865995087.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/9947881768.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/sewujejogudomugosexu.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/vazabufadimosinosedezupak.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/nafinulusifanug.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/gazojekebakepuvosagexafax.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/gawapufap.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///36807580071.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/251951640.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/33786892100.pdfIn PDF document text
    • http://yepuco.com/uploads/files/lopifu.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/32790693145.pdfIn PDF document text
    • https://telenovella-bg.com/files/49684572703.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/79963212677.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3af069d0d---60897033854.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/54039739569.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c205eae4c---xemesedobada.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rb34879aqv7im6i62nh3j8krl5/69010844093.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ce45f2ffe8ec4f097a5ecd0f121dae62/34685807371.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/95048072797.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bofujatoxabusob.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/78805171811.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_off0000cbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB5 10540 bytes
SHA-256: 9afb336b2938007a94725c09a45ee8142d9fdcdef13818e67ec3a8ad4a7346e9
font_01_sfnt_off0000e3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 21584 bytes
SHA-256: bd3a6c4abb0c3d0ea22512b01cbabbb09fa96360e60d09d3672307618041d336
font_02_sfnt_off00011d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1