Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b83510793eb097c…

MALICIOUS

PDF

86.7 KB Created: 2021-06-28 22:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3bda609c9b72f0d62332a305e1a343b0 SHA-1: ccf8e1e3a87cb8df2a01b3d6065b86216bf1ce83 SHA-256: 4b83510793eb097c668c432fad8c4f05bbc1374710c515f7c54b6ab7a90d803d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and other disposable hosting sites. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://rockpapersun.com/upload_mce_image/file/69830530894.pdf In PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160852da092c05---dajusojegozekiviminol.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/loduvilomukirapokusekude.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/a94f4ac2703dd77eb1c573914a471acf/gaterekikegumebivinenalum.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/58167337917.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/qrvdfomn699u2o3nd1tkvresq1/31870673298.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/mafelofezugopojese.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/9dca47b02fda5c6aa581359e5e1c2d9d/dadulawixal.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/gusilavevuvezoxukuraburo.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/metan.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abb0a61289---28750532896.pdfIn PDF document text
    • http://plncse.hu/php_data/file/88786094120.pdfIn PDF document text
    • https://campermagazine.tv/public/file/fifowitarujemiles.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14d2055d3---1949857704.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/94df749eb6be3d124aad022d7a7f4bd3/72139860561.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6af93157a90bff69c935850f1c9478e2/logavezuruvogurosubap.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/nobj0375o65oimjotqvota4s42/23943728289.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/fomudidomezadi.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b225a10bf9---51857317885.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/66778362335.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/ad405d2872455dd7f6627b4b2c9444a0/92446976339.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf70501b745---91404398167.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/83efe0cfc40a59422682446255104d48/14419739508.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9aed7c305---xinuzajap.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/e61eaf4f04af6163fffebaac95913ad6/tipisemobemajudamibit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=waking+up+hot+and+clammyPDF 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_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 10860 bytes
SHA-256: 1855f2ce8ca87e493f5e129a5f12a499b362580e64931006ad83ce70b79d772c
font_01_sfnt_off000109a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B4 17012 bytes
SHA-256: 5a9f34f36cf03232dbd85868ef975c1a9ba9b8ec70afd8dc11e837018311a8dd