Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff781429d0ee061…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 03:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 56af7c287422e0f1ae3d1fa84bd96e6c SHA-1: 00f218069a1bc2d75ad0a4a3a17380030615a4b1 SHA-256: 9ff781429d0ee0618949ad76637e4cd1cd520932537d1678f0cf48f06f947a03
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 document contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of external URIs and link farm characteristics indicates a likely attempt to redirect users to harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://wastran.ru/uplcv?utm_term=how+to+convert+files+to+pdf+online PDF link annotation
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9653795c98---99423536048.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5c5218ef494ead0974a2efdbd8b4792c/30198680378.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/janexokefelipabej.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210821023430184.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/53204021083.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079053b17871---55171439624.pdfIn PDF document text
    • http://arslanemlak.come/file/93022055625.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/refumoxi.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles//files/larutewapaj.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/pamuzokuvotexanovu.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/d93255e96fde6e1d76bdc6abc6c9b1c0/73320244780.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f85941a6d793b551c9dc439aebb14200/35028063748.pdfIn PDF document text
    • http://seritour.com/rsm/files/sefadimudamajafesibo.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/xodutorenezogonizusudemow.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ousaqeq611ci00ssv1oqd95o1j/8765174939.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/31699414622.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210729_F8A4631A0C4A0FA0.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/af1491a69a42d5b55473fbc86ed8bf12/49317057510.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/8btqdre7qae3u9o8htu79di5lb/mewuge.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d2d8a6e57---ditodavebolijowokovun.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_off0000e9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 18000 bytes
SHA-256: 1c1cdeba9cdbf46ba0642d201e7ad913507faee62dfc4d0a9e49ac55a158e111
font_01_sfnt_off0001186c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13083 10592 bytes
SHA-256: 3ad6eb9eb74ba06237911fa196f5667a194da2857af5a3e8034a857ea9551770

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