Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e902979aad164eb…

MALICIOUS

PDF

75.9 KB Created: 2021-09-03 14:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c27b85aaba3b48aeae711e60436f21a SHA-1: 8d169c982315883b723767d36f4aed8893ce8841 SHA-256: 6e902979aad164eb730c5e82468e80f338c482fd0a3d491275602fa5a31b1e02
156 Risk Score

Malware Insights

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

The PDF contains a significant number of links pointing to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/n8aj8mqb2v4h0vin28as2mfdt8/12152644264.pdf In PDF document text
    • http://birzebbugastpetersfc.com/files/file/70063857864.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/77056215353.pdfIn PDF document text
    • http://faradbox.pl/files/file/98642826506.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/vumubebiloposizoput.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14c957756e---molosokedivodujos.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/wivufomivinilazesotokekuw.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5ef0d4071---vepomafiluni.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/rivorajeku.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/8d9667cb1ddd54bc1f6de9505fdd6f64/91757606678.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/s3hustt62dsqaedi87ijfp636d/29105116188.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610aa05c42b04---lisixagusudisirakuwogo.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c5945b5c905ebac5be091e8c4d335e16/64900986224.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/77796013839.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8747c419fe35f782018906dfcdf85b3c/19051758878.pdfIn PDF document text
    • http://rahway1968.com/clients/5/53/53e48f2724afc57738bbbcfbfdbdad27/File/fisomubatirozijafapasetu.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/14574060513.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/38999830924.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/rigebilix.pdfIn PDF document text
    • http://spiregene.com/image/files/20210831_222428.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcc32e6266---puxasame.pdfIn PDF document text
    • https://meccanicagambirasio.it/file/8631224599.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/84629822690.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/0725b312dcc9bfa1a2f7bd74c13fb57f/10680487316.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/ladovuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=callan+method+book+1+pdf+free+downloadPDF link annotation
    • 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_off0000bfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD2 10904 bytes
SHA-256: c68c57952592ebf78b042b5a38e1e5388be4507bd347112c12bd264f9cd57ed9
font_01_sfnt_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 18076 bytes
SHA-256: 299503dce4740c2c99b2077cf8f31eef4b01aa6500fbaaa5c5af78426daa4eae