Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc110c91037b887…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 08:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d095d3b046f8e53f0ee12397847f04ae SHA-1: ebe6b5016e73f488f6c141e326a2e174193181e6 SHA-256: 0fc110c91037b8872b3a4c76f00fb5fcce908faa1fae91af97e616cf64dabb93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e51b13b14e19855751d59fa9bf08dd32/52285162967.pdf In PDF document text
    • http://nissanotogovap.net/uploads/images/files/49467755425.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/wesarisexi.pdfIn PDF document text
    • https://protrialse.eu/files/files/vajuben.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/93865223510.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/5740314029.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/gegegoxabimi.pdfIn PDF document text
    • https://nyig.com/files/file/vumuwipupifopewabuner.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/xiligimasisomimazofunej.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/zumejupobigavife.pdfIn PDF document text
    • http://flathead.herosuite.com/userfiles/file/bogitibasupugetesu.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/lovakafodelar.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/25035594219.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/segujofafug.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/lowekoguluwodivubosada.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/p5aq8rbe1qmjuf2p19951ciav0/jilimiwubobomudoxeji.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/76337082990.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd5aa62d4a---kikibubexariluboj.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/62053966781.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/getabuvasixara.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/52459223508.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/24000700649.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/selifawavobobufif.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/lapopezam.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/58809948856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=change+background+apkPDF 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_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 17968 bytes
SHA-256: 893b2a398d1477c4d442088474922367bcd46032b67b3d07652802b7f740811a
font_01_sfnt_off000116c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDA 10752 bytes
SHA-256: c83615bcee6f2a4696dbef1cf58f9f94f5a995c4615a03268439083c41717f84

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