Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34a61a8d748318f…

MALICIOUS

PDF

75.1 KB Created: 2021-07-02 01:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 62d50420ac05ad69cc6de4bcfa8a16b8 SHA-1: d9244f41f05c6c93440090040f009e0e8d5bc7f3 SHA-256: a34a61a8d748318f3bc0796fb17e403f6297eaef4ea0633117bd5d7f5b9aa42a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it functions as a link farm to redirect users to potentially harmful content. The presence of external URI heuristics and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1687e3665---mamewusuzagirexakesojixil.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1ae9a6e8f---28454429308.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/72441743184.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/goxelidozujukufefa.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/55370864152.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160995cf8da7ab---zuperarovaguwa.pdfIn PDF document text
    • http://strandedtattoo.net/file/namabozikoxebafaf.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3a15dd9bd---63009301124.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/fivemojegafud.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160861ec40d36c---85528528027.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/518d2ec6302bacccf1633e87d050beea/64934922663.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/9ue9hcbi72tqi1eel9of0bkrl2/tadoduvolodovavixorefikez.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/fudubapa.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2ba801ced---3848810692.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/letaxejodogiwupiz.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb0941cead---gitagokifeb.pdfIn PDF document text
    • http://poorclarescork.ie/images/90509225706.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/8e141fe8a314db201c4c4370cd2408fe/jepudigekuget.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/gajotaso.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/rotoxasotebanutok.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/tobiwuwadot.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/c491162dba9c49d5be9d9029e2fe8c2f/40789467117.pdfIn PDF document text
    • http://jucal.es/images/file/60520186151.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e06578c54d---97141900456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=linear+algebra+pdf+notes+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_off0000c2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E1 10856 bytes
SHA-256: 914aa9b476dc1604b03dcbb7e75943d360e46b1305addef0c6e298c0b6b8ad18
font_01_sfnt_off0000dba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA8 16700 bytes
SHA-256: c50fba2de1688876cc25f200d4f0aa66c245cc45b2a4be490a8744af1248f7b4
font_02_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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