Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bff60966486869…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 04:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b2026e5e59b20dbd817ec63a00dfea31 SHA-1: 0aff7561a5a7ea1dac5a67bc55fedbe52c85c7f8 SHA-256: 50bff609664868694f724cb23a71c5a0e88b0f7a368e08bb002f038806539688
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains an embedded JavaScript stream and numerous URLs, many of which point to compromised or disposable hosting, forming a link farm. This suggests the document is designed to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medianet2000.net/amm_prod/image_news_popup/file/divotorobatezasumud.pdf In PDF document text
    • https://xo-sound.ru/userfiles/file/xuliwazibeduvebuwe.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/kopamowerejupavodogata.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/zilixogavune.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/ruwokamu.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405824cf34c---pikanijile.pdfIn PDF document text
    • http://abwrva.com/uploads/files/69313983709.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/19339972154.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16134a3883dd92---fajepijumo.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/kufase.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/96471694464.pdfIn PDF document text
    • https://redac.ch/upload/41495169963.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/89389211894.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/23636990353.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/gapilazawowum.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/65641428905.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/46695550958.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/juwevafiz.pdfIn PDF document text
    • https://limsurdua.com/contents/files/xevijim.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/galuzosuramogovufokajikim.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/49324503346.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f262aae49d---91326882752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=50+shades+freed+watch+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_off0000d469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 10456 bytes
SHA-256: 9a64e7f9ed5920a9e21586ad5284c83cafd637c5939c012abce467462fb38e6f
font_02_sfnt_off00010484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 16788 bytes
SHA-256: 8d47b31c4ebb4d9e77ca2a7215e541c47fa75f64f52ce35b926be39145789a17