Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28837885921ff3f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 18:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45c850161b42bcb8f5cd405f984d4bfc SHA-1: 9541d79c11678c919ec0747e13f099c8b4d63f4d SHA-256: a28837885921ff3f8ebda4e9df5b995242e411f56e0e03dafc0c3016ac51adf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. These links likely serve as a link farm to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5299cb4b2---dajadufosemomo.pdf In PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/97976939681.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd263aa0b5---pifibifuxogitegibesojeb.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/62788710251.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078210b7a8fb---76416587940.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070278a3e65d---89769495287.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/38034597948.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/wijexikitajumenonule.pdfIn PDF document text
    • http://snsi.jp/image/news_file/futatemadavonuxajul.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/50618298259.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/bijorajuxogojixeju.pdfIn PDF document text
    • https://theurbanthinktank.com/files/jowisu.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/libawizotetuzoru.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/kj6p5gvdkqv33cj1apfs30vk65/49625600103.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/budodozix.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/74693340689.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b17ffc10d64---jukuwiwemilimigibij.pdfIn PDF document text
    • http://kimthienbao.com/userfiles/file/ragireturozapipujez.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8d73b7c65---tatataripezefajena.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/uf603a5hpranrnfjigvvhdcs5k/memubufop.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/fepuxunopipirasurez.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/87559489580.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/68301064380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=interjections+worksheet+freePDF 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_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 17720 bytes
SHA-256: ff05b34cb0904eb30192f87d8ef4306fbe1862ad22c10041774692118c6393fb
font_02_sfnt_off00011c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4E 10484 bytes
SHA-256: 6a8730f7aedbc4ee5de1220a2b1a746b95ac6b89393d5e6e82373d23649db9aa

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