Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5cae9fdf80c870…

MALICIOUS

PDF

93.4 KB Created: 2021-09-03 10:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 761a7aec27155fd37e4cb25885f9efb8 SHA-1: ca9501d30e7899cc3f489a8e1ecb0b1881f61dae SHA-256: 6f5cae9fdf80c8708e40af463d16c4c02d0be66dffe3df745f4a9cc444941f70
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The file's structure and link distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://www.rapn.ru/ckfinder/userfiles/files/40978482921.pdf In PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fa9826d300b0ead651c1d4690b51c870/jesuvukovikewobapu.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/6399126cd0a9eb1e884cd15c57d78b90/wejodiw.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4c81795d7---62069450626.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087cbd99bbb5---vadisazagob.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/v0t65ps33h8cdimohkf712i7a2/bitebitologido.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/76235945854.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/rerebuput.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/87283152686.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/23thgg0btde2mhg4b6vnat8c47/nixugosemi.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aa21c6468---zarirewewodopebofope.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/93488333707.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/dorewonub.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/56637984173.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021061108334973499.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e43ba86d40---venipuzuk.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607234bdad4f3---50850702474.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160e24e04d0dd7---daxurupumubo.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/53c87e903f1da32bc8fe5b7513202149/viwidolegaroto.pdfIn PDF document text
    • http://mweb.cz/images/file/misipaxamotikom.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e94652d5b3fd9dc057f2d96cbd2413af/noxunarazibosasinaj.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f7c937ade9e---67553159964.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/42880687963.pdfIn PDF document text
    • http://stevis.cz/files/file/kepamaguxevup.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/99696890174.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/bitozeragiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=magnus+chase+ship+of+the+dead+pdf+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_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 18596 bytes
SHA-256: e8f264f1116f89c14d371071531a8993c6cefcfa751139b7c71154c782c3a2d8
font_01_sfnt_off00013647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13647 10948 bytes
SHA-256: 2c5355cac67a3202885490680961619ef227d799f6ba6aa01b0a2f04d0a06cc2
font_02_sfnt_off00014f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1