Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95c9e5498ab7f85…

MALICIOUS

PDF

89.4 KB Created: 2021-08-23 17:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 98b35128d363bcdb4c447b2b49204a74 SHA-1: 6150d6d6eb938f5f8c22bbcdceefbf101a0cdee8 SHA-256: c95c9e5498ab7f85d65cc43b70fa960f13623a517e0c78d742c638f80be2addd
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 as a link farm and a potential phishing or malware distribution point. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous extracted URLs, many pointing to compromised CMS uploads or disposable hosting, reinforce the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/ad5ae2d3f6d38dd0b42fe735c13c41b3/88515388286.pdf In PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/werizovufudelilivat.pdfIn PDF document text
    • https://ekransamara.ru/files/tapamunubabamalojura.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/64efj530n6f4059pt75vbucgr8/76468071894.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/f753e533af98b28eecab086822e1b176/safanogowuzopi.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/33f40f6a0f4599905502541f334b9156/3244885926.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c7dfca053---43761568605.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/4bq5mlrmhpgnpj2tb5qdiu2ug2/92369692428.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/kedavowositakage.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cfb03f93843ac91651e97aa25837109f/88184894644.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/8a2214f1d5bf18204ad081a255652604/pilalafatived.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/2459a4c75da11b6e3297aed2bef370b6/diwixorori.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071ba33bceac---xaroxezapuveki.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/52132364040.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/muzebejumulusaza.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085497ddf1cd---mibapinutefoxinakebisev.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/95507516263.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/lorenubobopobok.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074aace1c913---35862157942.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e4d85ab44576002f60e9a9bc095883f0/zifujefobodokazadavese.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/6salf5hl69t191eg1pm8lceeqb/kidepowetobap.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/775bb541a5406eb57b1468ed06b2a097/mogaz.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607df034a6f4b---junato.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/tibenorisufebesedusa.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0701/3b3c3025981d8fa49414200e8a4cb1d3.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=radishes+with+butter+and+saltPDF 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_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001126f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126F 10596 bytes
SHA-256: 38bc37eab4f42f21a55a6b6708a45072cd83959532c579e017768394a67ce75e
font_02_sfnt_off00012a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A97 17164 bytes
SHA-256: ea98f7dd5a26907ef0eeb939d16db8dd3f688a4092cd37df0f3e1d9611ccbcf5

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