Malicious PDF — malware analysis report

Static analysis result for SHA-256 53efceffb96a9482…

MALICIOUS

PDF

111.6 KB Created: 2021-08-13 18:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 2e3a08df6fe4d66570e7058da5cbab9f SHA-1: ff648dc79d94ce2e55e47e47c132bc94d3b69b94 SHA-256: 53efceffb96a9482509393e77f6ab6e0c3416b78b9695bcf7507fb1848e0fc2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c185c4b583103be3cf2dddcbcb80a5f9/57086686480.pdf In PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c5e6784b87aa1cab3f1227e321ae50f8/tazemuro.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/55009429167.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/tonibupolurudozelujisuki.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/wuzogoluputu.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/napuboselo.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/g3m458aj0je90k5ku99ceefij3/divozuvolamo.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/61071217237.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/9927675744.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/laf6u1kkf3ccv86tq5miqe5ih5/43359103752.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/jefikasomu.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/48630583583.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7b0e7a10f---71499043585.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b99b4e835---dolasi.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/ae304f2ac2de3f3ab8b3d415ff46fc69/34610568990.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/bodotatetibokubewukarege.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072a61241212---xigukexureduvakibatona.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/nonubereditarexej.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/wezoxizifilitevux.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/chshugnaiiav926oc11a46kmog/xutageroxogu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160912e2eacd29---ruvuweva.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/02d96ee23b00bab532956ee397b075b1/latulusazi.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1628861191.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/kamadodopukonud.pdfIn PDF document text
    • http://bjjiffy.com/upload/buwobivajukedobimozir.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/sufunugor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=syarah+arbain+nawawi+terjemahan+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014563.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14563 30664 bytes
SHA-256: 47e0be2d9caee4dc7c3694d56c21766c5182eb7ff0d77956d2b6acced7fd52ac
font_00_sfnt_off000111c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C2 20256 bytes
SHA-256: 179cad87faaff6608281d8cbf8743ebe7f92d90f6281b86f66a7366c307a2a14
font_02_sfnt_off00017c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C79 10976 bytes
SHA-256: 2da195023d44839c50342306a34f13c74a94e6888a1a42d6884d52e25908fa18
font_03_sfnt_off00019598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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