Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a076aaf4aa892a…

MALICIOUS

PDF

85.0 KB Created: 2021-08-17 02:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d3fd1fbbbc52a127b5f33bbc6543c836 SHA-1: b9ee4f322145e17d1e826bdea9b4ec20157f0c82 SHA-256: f4a076aaf4aa892ac85c7149a60d73da9677612395d5fcc86357f1624610037f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, forming a link farm. These links are likely intended to redirect the user to malicious content, such as phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=addition+fraction+worksheet+with+answers PDF link annotation
    • https://mimpishio2.net/contents//files/61409298852.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/46086319467.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/82743195456.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/26a3495d2a6f488c744708934504e27c/jaretepegoketugifudi.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/52503ffbe1c295fa672066e93fe507c8/92068207826.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ri84buk0gdls2fj5kmnb6prjr4/98738688337.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796b4b9b542---77784004569.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710f989e7d7---xuwujezuxitulitiruvubap.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/98019862829.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/16590486582.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/645a76ee773ffccec4bdd580ce032af4/91883239237.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b84dbaa14---duzuwo.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/51479792489.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/33782263464.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/dbfb77e0f1746a12d8b2e84586971973/rerurokuzivakiverep.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a756347a6bc---dukuka.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/6l1gbuskrl7fvjc0r344db901o/gadiw.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc42696cd19---gilotobevafeliku.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606da1c31cb74---60270960622.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/fazukedofevulun.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/lekipuwono.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160943385a8654---refode.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ad8e2221e---73813781200.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_off0000e24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24C 10684 bytes
SHA-256: ba481757aa8109c36713fdcbba43c27e2020a4b090bc2b74c8d266ca9eec668b
font_01_sfnt_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F0 19344 bytes
SHA-256: 022f79206efa75ce755862e3237ffc5711393a328cec5bd0d267d23ae9bd78fb

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