Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e2b2d0724e5949…

MALICIOUS

PDF

77.5 KB Created: 2021-09-16 20:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67cc6c2556ea86130fa16c94d41f8d78 SHA-1: 30368e4ae23235a6f2d486f26d5543322037d481 SHA-256: b0e2b2d0724e5949391f0dd231d70a17067c682fb765d72628d4af3172144d44
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://ancient-theater.gr/media/file/timamesininofevud.pdf In PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/88769258804.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/xixelawabapotopovaxelib.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/gizoruwewubamujirobiwud.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/bb69af4cd66c2579c6bf2d55a9a285e2/xisuzepazurujo.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/kixewopejim.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210902015954.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/82252910409.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/wikudejesop.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ih613pmd0sg1a6ajeaj70mtob2/21576842187.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecdb7b6c0e---47928637920.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161403dd587ec3---vuxexinu.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/50982211770.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/10569217949.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/58214077663.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///lodinupabivalogupazeleju.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/4060261961.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/24232027574.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/72610960130.pdfIn PDF document text
    • http://chemicalengineers.ie/images/vizisaponixivikamulusubi.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/nubisofakemasu.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/luvimubinemixo.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/bakegavakin.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/reveliwid.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/15605021950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dark+phoenix+gomoviesPDF 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_off0000c604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC604 18460 bytes
SHA-256: 898e2ea7bee2b8af92524f8cf9fd6f4c311800f19ebfd455bfc61c709b2c9276
font_01_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 10816 bytes
SHA-256: 8ae1ba2cccfe8577600a15cbc670d3cbd1b1987ab09bcfc14536a0feeb5f1d2a
font_02_sfnt_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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