Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a761ad16998723…

MALICIOUS

PDF

83.4 KB Created: 2021-08-31 23:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 91cc23e504230d01bf6c09bc72073bae SHA-1: 04b79b1ec854acc1f726bf2b8d86c62b8ada035f SHA-256: 17a761ad16998723f677d066fe115aa4fec4a9a656e8577867e09f20a8407c2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware delivery document. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection scheme. The presence of external URIs and a link farm heuristic strongly indicates an attempt to direct users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://zaun-produzent.de/userfiles/file/palarivizebowe.pdf In PDF document text
    • https://flardochform.se/userfiles/file/rujeno.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/kijuporokotutedurazo.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/10088a47d7996d69a0579ba8c8e49ca8/kegorezafoxutolor.pdfIn PDF document text
    • https://camelcarpet.org/d/files/febevevu.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/kajupivuvuxizujusog.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/23397126421.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160868c23c8d46---88763305556.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/48195265869.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/runiserefofaxemelupa.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/xabuse.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/bc6f88a0f3bf4f676fd4c4089ddc7a4f/kisokifeba.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/9529a286b47ee1339b8198deb2545ded/28005372654.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c33502b8eb2---wikaxefevetugamo.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d531795039---48036746738.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/jowaserafuxirasi.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/novuzupoxomozetexebos.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/muu3kjdjd80uf1u6g0385b48pj/68226155523.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/vatorut.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/6910335834.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f80932e9b---26432981779.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078241ca1284---71989658971.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/duluvotifonaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+change+the+color+of+one+thing+in+photoshopPDF 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_off0000e040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 10836 bytes
SHA-256: 80215b50781e577e616ee05c4108db87f7930ff8cf71c785fd9f2d5176e78b9b
font_02_sfnt_off00011151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11151 17648 bytes
SHA-256: 74cfa31c35dff45a7a4207f80154057edbcefa2cc047b390b08eaa4af9eaea55