Malicious PDF — malware analysis report

Static analysis result for SHA-256 805520745c80e498…

MALICIOUS

PDF

68.7 KB Created: 2021-09-24 17:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 823db52a2ef49bb747390bd199469035 SHA-1: adf290c6c914d69daf881346b42e49e6ce54ec12 SHA-256: 805520745c80e498ea20109a0e917afe63e4ebeea7036665d95e1408180ca791
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://medvor.ru/uplcv?utm_term=horizon+4+android PDF link annotation
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/bf9f23826659918a5ac7160856b7f2f6/rumebun.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/10677972584.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210917214545.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/99890208553.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/49171120663.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/72050111705.pdfIn PDF document text
    • http://domexpo.ru/up/file/vinuwazadugeli.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/fapiwisasuten.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/lafipuramul.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132b1c906359---bunezitizojuzitaw.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/62jvlc25d1bme82q06h8s8vi0n/gurur.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/wawizegadale.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161347de0b448f---vogaradezebarotomowo.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/wokusop.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/jaxijafoga.pdfIn PDF document text
    • https://oktatas-konyveles.hu/term_extr/files/82340823845.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/rufodewetadidasalogakiruk.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/mojopimejeza.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/kipemepuloxud.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/veseke.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/78133648730.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/fuvabemojogozob.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/81462746132.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/35178556063.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/tegadizomivazik.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_off0000b1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B5 15180 bytes
SHA-256: e72566ef793319628ab6e513d5d7314ea132196c1077d26a2f334e65fcb528ce
font_01_sfnt_off0000d75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 9924 bytes
SHA-256: 4b1b5e0e1b6d92f863152cdbb56a0ac35f58a7e4f7ae533a496649073129942d

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