Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab286c09814930a3…

MALICIOUS

PDF

75.4 KB Created: 2021-09-09 01:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9bec1421a72192fcad9a94d7d3d41b83 SHA-1: 58d6593114b54e8807c17932ca07b259d91bd6fc SHA-256: ab286c09814930a3aeb8a843b89e03373519f68d6e4672e9a2946f1df98e0c69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URI links indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cructi.ru/uplcv?utm_term=bigasoft+total+video+converter+for+android PDF link annotation
    • http://wumag.pl/userfiles/file/56570309274.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/xaxibudezami.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/dajisujeja.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/fevuwezuwarobelu.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/eacc165303372575174790c8c5c6159b/18696358093.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/dixinezujesewadobewo.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/xugapufofuvadafinegegu.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/82225485860.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/0fadde5f8d1c00a9c8cbe6fded48e915/30535184642.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/fibarut.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/64132724133.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/vapopesogujib.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613433e785c73---xovababefelibavurabo.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/42900582855.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/difowuguvisezob.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/nekuvibujumetetokozobuso.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/xatofed.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/81546169048.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/qdcnm4n44dl9nbasv08vlsav7l/85380528669.pdfIn PDF document text
    • http://perksys.com/userfiles/file/manesodoli.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/78458060865.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/dudid.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/bisidiwogozo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f514bd95bb---funawikiretumudimatep.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_off0000c30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30D 16996 bytes
SHA-256: 17f7fae02b56d78cb6c81df20c39a3b2a697cfd6176b98bf890d149bbef46186
font_01_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 10768 bytes
SHA-256: fd90369fc6d484bf0d9110a5a5e29e39ff84092b0529faf696a11966ed5998bf
font_02_sfnt_off00010798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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