Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42fc3f29a2e2d4e…

MALICIOUS

PDF

84.5 KB Created: 2021-07-16 04:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a1eca8d2fefca10442a2c54bcb1e2064 SHA-1: bb7f130a54a33f759ea9cf39cc88de141bcb52a3 SHA-256: b42fc3f29a2e2d4ed9f9e2c8a75b8e59fba8a5cd021a9486ead6e50579a9a036
156 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. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of multiple external URIs and link farms indicates an attempt to redirect users to potentially harmful content.

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 http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160817593768f2---1166791574.pdf In PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d9a68dae3---sofalawikuto.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/o1lb6dtimfgjt7shp22a2eg4g3/16909948103.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ece493406845924396caba3c43328df0/jimupesazosotobixibi.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/8390370661.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-10/20210710191155918486.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/61e50b83d4bf178e5ab93c310728e138/fewalefulumagowuwetuxa.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/6856154929.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/tumireb.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/86489820673.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d987ee47b21bf094c498a8d1f1445ea5/fofonovabarafekenuxu.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/66602264364.pdfIn PDF document text
    • https://777mto.com/contents//files/lufaxekawajuj.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/vidasasuwusimaxizesidisif.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4cddde655e29e9a9b28db06716636a4f/86732092785.pdfIn PDF document text
    • http://cci100.com/clients/57496/File/56258998911.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/jclla7292jt7fvr068fpur12v7/ropowovisagejuji.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/1230802540.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094726ce1e45---30298176611.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfb22bfffa---12456087489.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/esm8dbj0ujug66uk04n7ne5ufj/19722671256.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nn6j00hien9ku80eddtd6gq4b7/83031952012.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/6f27bd9eaa6ca2b6ba5426d58ced2246/32087189428.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc4629658d---79697077708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tickets+discord+botPDF 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_off0000e6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B6 17656 bytes
SHA-256: 759a5b72e628eaf2f2b8b70cfa14aac5d5babc4671d3cc2559fbb01ae782f171
font_01_sfnt_off00011571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D88 10244 bytes
SHA-256: 5386ee01ed41e7918ca85e7157ff982956dbc1d7d7247f14a64240de7c435ed6