Malicious PDF — malware analysis report

Static analysis result for SHA-256 825927a83b1d3218…

MALICIOUS

PDF

86.2 KB Created: 2021-09-08 22:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a02e6fba57b10e21c9e454b0d21e12d SHA-1: 7cc29ed329668033969950e063174120a81379ff SHA-256: 825927a83b1d321807194ea606f814d329fc3a9da1107cb6daf445f3682af816
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites or disposable domains. The embedded URLs suggest an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://blueyee.com/upload/file/07123052447.pdf In PDF document text
    • http://hmondo.com/userData/board/file/55385064549.pdfIn PDF document text
    • http://elpijisystem.com/file/78421008257.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/3072654712.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132743a944b3---68919100079.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/gifiwikaxavibojusakurade.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/zisarapebo.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/sonotoxofeb.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/bozewapa.pdfIn PDF document text
    • http://didula.ru/img/file/pejukirinaronoguso.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/somegabakebo.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130284d81a9d---88717874317.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/91842553667.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/83033853864.pdfIn PDF document text
    • https://forumsevens.com/images/file/sabez.pdfIn PDF document text
    • http://decorstore.eu/upload/file/jelinikekokowabaw.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/gesiwidovuvovusi.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/6128028622.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/93522867569.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131abf092986---pofipiw.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///mamazod.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/nagig.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109041008181725.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/73943754324.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-02/images/files/butameribokidezozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=median+nerve+forearm+painPDF 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_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 17704 bytes
SHA-256: c7d52efd1e1b23b87ad770e230d92c7a1f839d79c4b4ff65732f1038a0a3eae8
font_01_sfnt_off00011b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B74 10408 bytes
SHA-256: b1c68762e204cf7720635b646d91834d553e4939c261648538b497f6b71c22d8
font_02_sfnt_off000132f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1