Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7a141fd7a746e3…

MALICIOUS

PDF

103.0 KB Created: 2021-08-14 14:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0677f2a8721d9d3afa7bb30441a3d387 SHA-1: d265b925fd9b558911fdb6dff24c903c7b2dd892 SHA-256: ef7a141fd7a746e3d889f37837ff219b4c5fe2cc19e635956408f9b98c4008ca
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. Heuristics indicate a fake invoice lure and a visual download button, reinforcing the phishing attempt. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cructi.ru/uplcv?utm_term=how+long+is+the+real+estate+exam+in+nj PDF link annotation
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/3baqp8mrhpddq1a66fjejloebn/moragutowelugu.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021081304464617.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/7202969178.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/a354207e8ea36532a1745b9a6f868136/86454228417.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8d47003d7---80521451984.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/47755994311.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ffe57ad6a7f---91014991580.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd0914415---kinepejoba.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab97e2c08e2---736109515.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38e3644902---97625464529.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c8b658a8cde6a3c6efbe5b53626cd76f/pajuxogidewuzuvab.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084732eba468---70271893638.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/16106751137.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/41680698377.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/gateninove.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d98d9b4dd6---budebikube.pdfIn PDF document text
    • http://peoplefineart.com/assets/202107/files/20210718225126279723.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/kebubofukasewaj.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab89b72254---sapofomuxowimuninu.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/49c769325ddb9eca437d3dce9786247d/vowibugojunepup.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/dovidaserep.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2fc70a8b5---tajuvewimab.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/moxeruludexabedali.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16106234e2dcb4---ganexejinureninoziz.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/53297743320.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_off00012ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC4 18392 bytes
SHA-256: af3f2e35a4564cadff605318a717f56f452586a48cf6cd0901043a31de626f91
font_01_sfnt_off00015b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B40 10864 bytes
SHA-256: d88a49a53e8cbb3bf3e1615741a4e0012df72c6838a3c9414c8f924f6cf48b98
font_02_sfnt_off00017430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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