Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d068f3ad0f74ca…

MALICIOUS

PDF

89.4 KB Created: 2021-07-01 09:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8f9eea025b1b3f8db37ebdbe3ccd1016 SHA-1: b1af0edc39c71c60d711cc420e07593bea438502 SHA-256: d1d068f3ad0f74ca79a385136ca8d368c65e50d2167eb3eb7fae5223fc406a5d
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 and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or lead users to phishing pages. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://oniceh.ru/uplcv?utm_term=regular+polygon+with+6+sides PDF link annotation
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/112526b7fab091ff5b62055277f7b9f1/pebojubuvegikaseri.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/90268159801.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/1051528952.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///rugebixapiwuzaka.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16089fa7db2b97---25763118780.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160cf708c3243e---sunokavirilitewi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/307eb0b19cd1e88e99553c4b95ea4ad3/sekixix.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210625222934552.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/4563528292.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/40796758447.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/18654508866.pdfIn PDF document text
    • http://prestopc.it/upload/file/zopigozidawapajebat.pdfIn PDF document text
    • https://corghialberti.it/file/22276837324.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/falezanakutoginek.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/44694841579.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/wolasidizifajidudijem.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0f0f392f0---saxadagepotiz.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/74441932b4d98e20df90a58571ca85ec/zodomaxuwozuwomenineto.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963c662d733---senufomazuxezuvorodax.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/391975314.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21ba0522a7---woxuru.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b4948b89ad0---80309955327.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe2fe487af---83359995084.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_off0000f5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E04 18284 bytes
SHA-256: 4679ba3c838b3e07897c8f5bd91b5ff1849198b09d69162ec8f43c62f2db3428
font_02_sfnt_off00013ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA7 11184 bytes
SHA-256: 73a40bcb777090e68232b7909652aa2ac635927be9ce84f22f9f20ffc5ed5d85

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