Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71eadfb6cdad94b…

MALICIOUS

PDF

78.2 KB Created: 2021-09-03 11:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f30579af9229a506b1d5dfa0666472e SHA-1: 0a256d4437808cb0deb1524df1f2a610883e44ac SHA-256: d71eadfb6cdad94b878b2f6abe32e83debb6b23336ae4ec5e387eae2e3199fff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous URLs pointing to PDF files on compromised sites indicates a likely attempt to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://insk.ru/img/userfiles/file/jubetomoromufexusip.pdf In PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/nejiwesesugeviwamaviwa.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a202c15a11c---11155822423.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609d39558c1ee---wodafovuxinax.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757e5a3326b---rudaguneru.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/dulokidozolamofosupulimir.pdfIn PDF document text
    • http://scpt.it/userfiles/files/jinab.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/29777078811.pdfIn PDF document text
    • http://builderall.info/userfiles/file/34448288214.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f37c87b0---retejojarebaroxixegofab.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/71257086391.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/22307177906.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/fivusasodobumuzojuroki.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160962230e0a2b---64404536810.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/17754128655.pdfIn PDF document text
    • http://apcmagon.com/userfiles/livilujuvexinode.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/12926bba5368cc85b98f053364416a28/zukifemefalikapezumeguzir.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/4587fb9afb9cf224693ebeb18517ac29/10809181641.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210831060338.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/gn9onrvsp48ulmia0ia10b0ukt/64684693761.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe20274e4---xuzuzutinazojibozeronul.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/09d97444c1f1fb02c6edf49775546bd4/49698175934.pdfIn PDF document text
    • http://iphysiology.ru/upload/zobadivexebovafusi.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/24350802014.pdfIn PDF document text
    • http://darec.sk/files/files/86737742916.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/9932439482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sharper+image+drone+instruction+manualPDF 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_off0000cccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCB 11136 bytes
SHA-256: 907d27802e2e94391fa0038489677aa25787d8e9f9345cf606d5e3ac75aa183c
font_01_sfnt_off0000e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 17028 bytes
SHA-256: 9c79734d3d9f0eca7299d44a41ae51534ec0c4add0e61d1a556799a1f41dfbf0
font_02_sfnt_off0001128e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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