Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca1eb2d8ddf81fb…

MALICIOUS

PDF

85.3 KB Created: 2021-07-23 06:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d9f4d9bd862e63ebabf7871ebfe4ffbf SHA-1: 5ca540f4f8c747ad562c0ae865b84049effc11b3 SHA-256: 1ca1eb2d8ddf81fb79a059566b5b360d03f6562d5767c931f418c4737d02c97c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations. The presence of numerous unknown URLs, many hosted on disposable domains, further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb4c15d54---67238869908.pdf In PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dbe284c1b---lokorupuxopukirepejajin.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/tuwokaxibotujemokik.pdfIn PDF document text
    • http://dzbnf.com/upload/file///86740905831.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160763b671c8ad---tojuvunujoraluxawewone.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/26655747387.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087b6f620f7b---ponugasesesopon.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/pemibutamagamawazipa.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607cb24c9bef5---japetapudexidemixo.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/30950409670.pdfIn PDF document text
    • http://ty-int.com/files/files/88124456689.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/20486410020.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4826066a691686bab0ba0e4a300eca59/netupason.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ba20687785838970b7dbd644d5c88fec/47139707075.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/lirufesalatenejujo.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b41d997e5ad---43518038591.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ogm37icm4d8r76i9fs2t9ae7ds/jebezofogijesigiz.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/fa60b5381a302d0c5c9a021e1b6fe4f9/fegelonepiruwa.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dfadf3d7c---71975948100.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///puviloziwilabomazusana.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/78b65ed1997cf8d1219b8bfbc267e4f6/rapibojiwawo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/9ec2f972fddd915eec68896e0bd5bc8f/79154028999.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608739293c452---fenojusedogepajijerefumup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=dpwh+road+safety+design+manualPDF 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_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 16532 bytes
SHA-256: 89fdf428a941d903a4f26c1ebc3326fced17502b75fb24aa5f659072198f974e
font_01_sfnt_off00011568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11568 11244 bytes
SHA-256: 4a3773b58e253cfa32c3c26d4d0824ca7c9c2f27903048c3a6ccd7d0cd4a9bc8
font_02_sfnt_off00012f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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