Malicious PDF — malware analysis report

Static analysis result for SHA-256 812fbd317ebcdcad…

MALICIOUS

PDF

107.6 KB Created: 2021-07-01 18:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cc15d98533d376e5995cfdd6971442cd SHA-1: 1868e31fe0b65d7699965dddfedd87e15c4f543d SHA-256: 812fbd317ebcdcad98934d5b1776f5a2b1f162461c2a286c6a20d99a4e169013
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm hosted on compromised CMS uploads and disposable hosting. The document contains numerous embedded URLs pointing to various domains, likely intended to redirect users to malicious sites or for SEO manipulation. No scripts were extracted, but the overall structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://smidgel.ru/uplcv?utm_term=prophetess+in+the+old+testament PDF link annotation
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/c9adb32de46219471a14d8dd3dc010bc/47018496212.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/kuvubuxowevurav.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/0u1h2tjqgfspvmt61v73f8dsud/70232417712.pdfIn PDF document text
    • https://bnovum.hu/downloads/78746288062.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/82189383117.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a00b939c8965944f93eb164af7ff52cc/venowudurobikedobasosekon.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/mfpga994opccb0nsnsve6f01h4/runano.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/fa5faa20f374ff9da5d35cc716127523/47151137618.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/96302231852.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/de64b3657156e90f05de0c81bf71cfe5/45465449552.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cb87f5c7fd5---18588975580.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/dobugolofob.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c76e91617f6---99142223821.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/92178841897.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/36226257100.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/95710857218.pdfIn PDF document text
    • http://fotossc.pl/_files/file/75005377654.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b120f5a5469---wisetisasog.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/82485796642.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094f4f3d7806---libuxebudinutulopibitewuv.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/41631c00ded645210335b105a1a8e039/sevodejawusibemip.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/16783759367.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_off000143a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB7 16884 bytes
SHA-256: c9de712d437bebff40dce698c978fde5f5ebc4759be25056ca3b8ca48718241e
font_02_sfnt_off00018797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18797 10660 bytes
SHA-256: d0cd1db3f23fd164bd8e65e1c3ee5bb874f79ce75ea68fda5ee22f7f0c080c01