Malicious PDF — malware analysis report

Static analysis result for SHA-256 d039828490148d34…

MALICIOUS

PDF

71.7 KB Created: 2021-08-28 00:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed26b9580e6128d5feb718734f04f38f SHA-1: 2594f68cc7320bbc5dae0a084f28cd2ee739a61c SHA-256: d039828490148d3435ccc7039f8657b492ba6e5b80a933910adea98f4ea0d3c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/38514c9bb752d0b5a01ff72812558263/wugapewadenuvavotigurej.pdf In PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160785a6a5ef36---nokamobaja.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160743b99ac372---tevofo.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727fde8cb7b---returavotizogusuf.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/31331459517.pdfIn PDF document text
    • http://teplospectr.ru/images/files/jotaronazi.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/47000470033.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/35848818917.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/82559173044.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/soevp5mklrronfpa55g9b0nh7q/55902979228.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/fc45b4e91a1382254bf1e9cd01c78f07/44568083435.pdfIn PDF document text
    • http://abworder.com/uploads/files/33887683566.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2d0a3f8b---vapetimawilawikujixukavi.pdfIn PDF document text
    • https://masihpt1.com/contents//files/reresonitemebutunal.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/labunuvisinifutedajiv.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c237cf924d2---75669168458.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/tivumidaloduforisigob.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/susaderupidadajoju.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/lifetoni.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/47de7cdfc64d5c00ee94444388caf99a/97921745278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pirates+of+the+caribbean+on+stranger+tides+movie+download+in+tamilPDF 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_off0000b1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA02 16648 bytes
SHA-256: 23cd1d90b23a7095ada04965959e4ba6c7106aeaf85edb30646129eb469fee71
font_02_sfnt_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 11216 bytes
SHA-256: 4b7728319b2984d13f8cd9bd53787fd5e01c9976c72112bd1090eaaa6c8fab84

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