Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7cd6d699e180969…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 02:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 59d72d9a9b6bf8abcbbe94b6db07436f SHA-1: 690c72a14757ae9bec7f6ad2cf8463d22f8c63c8 SHA-256: f7cd6d699e1809699adb07435ea84711f10becc73119c75a6078b3ff5fa01452
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 critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/73967ccfe477f5a8e7e4bb440cb08003/92043560390.pdf In PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/9af9b761a442a7c76aeab30486b9e0dc/51943996451.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fcj5rbfnorbhkko1s0b0inq4s3/nomalirev.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/c4617fc0b484da9d2db211d50999c2e3/58711501532.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/52310470715.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716cfc02fc7---dotefozolikonolimus.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/65513222371.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/vijaza.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/wemalisabazaxajo.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/par8eo1jvgah1l2sscdc7pcgo7/jomabikimawexatagexowe.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/83022370301.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/26521305773.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/37879302854.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/30162921424.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/rujilejaz.pdfIn PDF document text
    • http://mav-auto.ru/images/file/33510539066.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/70289973063.pdfIn PDF document text
    • http://hydrem.ru/images/file/91674919932.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cecf6b859---juvazinewuzaje.pdfIn PDF document text
    • https://kaimano.it/file/getadojusud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bangla+voice+typing+keyboard+for+pcPDF 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_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 16884 bytes
SHA-256: 7b8a257128adb5a3f876f697515b964243a31cb941da4081d157d7fcc3cbdf32
font_01_sfnt_off000108b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C7 11092 bytes
SHA-256: aa380b6ce40d8fb21c4dffba19b0db734ce0c4e914a946edd8603199d5b25496