Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56ac0134da87cfb…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 17:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1482c8c78b6d8516f0836d67a3c7ece2 SHA-1: 725d9d3c87aa4d7ed9771a7436e2e660eda8967c SHA-256: c56ac0134da87cfb3aa4e919988f90f9ec4ca1bcba45d725db156ff034ef94fb
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are designed to redirect users to malicious content, potentially leading to further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=dial+indicator+working+principle+pdf PDF link annotation
    • https://stormester.no/files/file/vobiwegezijes.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1a29acb34ffbec54fc1f977d83a09cca/83063943403.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7c94431e98b86df853591db5ae73c0f9/warivifuxomadudomar.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/68042766847.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/32582681178.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c339152c2c5---42602299784.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/81488007a645f09ccf07ba2b6ebcbca0/gidepilowenof.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4ed58e57a653a2485ad2d1f3b6024f44/52991808932.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11a230c7e0---zorevisoxudugidefemefotiz.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16127710009197---melirakila.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d9126abf0---94713499711.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea765471e0.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117ccfc3c84d---lowogalibufulovi.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/6ddb1b58cc08deb44aea61beaa9e7791/61262550483.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/wajikozirokuwo.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d7be4b7eab6---fovutagilejisol.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/69214224043.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/054b9ac236d5524ae1bf8911873e5b2f/23636137283.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/8202810985.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/6602598341.pdfIn PDF document text
    • http://fitviewer.biz/files/file/watelozujaf.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/12365495495.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_off0000d88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88F 10808 bytes
SHA-256: 2f91264eb0c30ba8555c3dd77a2eebf503356835516d7d406a2a71c4d1115c03
font_01_sfnt_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 17120 bytes
SHA-256: 4201032ef9aaca4cf7008960822f885ef6181d2136f392e09a72f6cb0ed809eb
font_02_sfnt_off00011d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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