Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf662e5a654e5f8…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 04:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 592f24c9436d133b13868f3c2ecd5a4c SHA-1: e02a90d877be8e1ea5af7909af7611bdb1561e3b SHA-256: bbf662e5a654e5f888b24ff2e858ec645cb39bf13a522f8c50c2609b63e17908
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download button' lure and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://catamma.ru/uplcv?utm_term=latest+tamil+movies+download PDF link annotation
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fee8884882---94366538742.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/53146438919.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b58bc118ba8ee1e04060a7204d0e33c5/51997647414.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/vemixivuvavozi.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/48387486910.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613127885d5d7---newinawokuwirojo.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/jumot.pdfIn PDF document text
    • https://gornjastubica.hr/files/dusidiwola.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/84631312901.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/salibofeberiwanuledulawaj.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/tagamirutumojuxeriwodud.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/nufutofivixeveg.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/nolagaxubugedurezu.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/tosafupobokedeno.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/9563084569.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/lijupigosejevuvofilivos.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca628c1d0---9703490937.pdfIn PDF document text
    • http://skncn.com/u/files/85996499732.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/94265597384.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa03dc656---zuxajikijumunovapize.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/libadozisetavej.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/26344119592.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/23300878477.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/90879411112.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/87090651670.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_off0000e425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 10416 bytes
SHA-256: 5bb298796ae365d6427fed5ecf634b8c6fe144e11f97c47a31abcca2b6ee7af8
font_02_sfnt_off000113db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DB 17692 bytes
SHA-256: 1fde6ec22c434abb8d87c34b793d93d7e703b250ce9f58c5f334a5924ff767a1

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