Malicious PDF — malware analysis report

Static analysis result for SHA-256 4315e1cddd6f68f8…

MALICIOUS

PDF

89.7 KB Created: 2021-08-23 09:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 414e9da2fb8981b67bc584ead18b3094 SHA-1: b0582710cdd241494ce8f3a0c4f6baf28aa29c10 SHA-256: 4315e1cddd6f68f8fbdd242fd79ae298427df5918c260e0815b9af5e25ccd651
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and a deceptive 'download button' lure, suggesting it is designed to trick users into downloading further malicious content. The presence of external URIs and link farms on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=executive+summary+of+a+project+example PDF link annotation
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f4d41c421d---pegalu.pdfIn PDF document text
    • http://oinworkshop.com/clients/6/6d/6d9161a7191ba42f41383a85782e2f4f/File/sipenovibudorowanofezoto.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/22795348702.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/dituzewiluvogobosilavisi.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/43292469634.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/62337239815.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/5890711927.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/48838511733.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/87284653945.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d35316b6---letigosegolip.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/27c3387a19ca7ea0924f2ff14ec43d5e/84746343087.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/n3erh363lq3dj2m1v8kn5f982f/nirazoteziwesasumanag.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/0015800a3fbd52b8a587f8c76fd4bcbc/32945808722.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/97162891177.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/munivonir.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/37451222795.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/3845764243.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/xavenus.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160addd0f9b1e2---zumotosujafikis.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/6610059376.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/88041658320.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_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 16872 bytes
SHA-256: 061c2709322eadbd13d7e50b2cd4081dd89534e1a009dcd20efc3f0c5d2491ac
font_01_sfnt_off000126ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED1 11032 bytes
SHA-256: 5d72c518da5babfcfa3090eeea1401cec7ef4370c769e0b2abd8e29bfcca8134

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