Malicious PDF — malware analysis report

Static analysis result for SHA-256 26864f876d3e0fc0…

MALICIOUS

PDF

68.6 KB Created: 2021-09-28 00:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 332323262768e6047a5ac017e35f3a3d SHA-1: fdc3d6f294169e1b4e66e746518ec22db21561d9 SHA-256: 26864f876d3e0fc0aa16a5c989feaa620db6462f421b4876009d945161cbdb66
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, but the presence of external links and embedded scripts points to a lure mechanism, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=android+camera+qr+code+reader PDF link annotation
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613414c7dbe8c---rafogabudazipig.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/14e65604119e1ead9711223aa7c82489/91110848660.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/47485048573.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/98256173373.pdfIn PDF document text
    • https://ons-station.com/editor_upload/file/mifukokuvidati.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/54083358866.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136af8a934af---nusijinumobajebenetabok.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/79731569576.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/dedofozelelokurar.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/dewalavuxomitekipob.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210912161203_dhu2b1.pdfIn PDF document text
    • https://digireg.si/upload/61937318817.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b66772eeb3---9355594692.pdfIn PDF document text
    • https://petribax.com/userfiles/file/29886476469.pdfIn PDF document text
    • http://osayit.com/images/file/wadisizalejabu.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/kadikenekexufujimovaze.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/taxiwinovumodakawurot.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/kizuriwilijuzozi.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/jizugujubu.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/t2dqthjmk9v3ebder1tnf5s285/sijaj.pdfIn PDF document text
    • http://tongweivietnam.com/ckfinder/core/connector/php/connector.php?command=QuickUpload&type=Filesupload/files/32795096673.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_off0000adcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADCB 10344 bytes
SHA-256: 05793d6529054009964b8e8e4d4c1b84f24af97e861140964c3bdcb781d825db
font_01_sfnt_off0000c4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DB 15860 bytes
SHA-256: f01b3bd1fa33841b75d77075628675885a6c7d3cdf925580ee7aae30bd0a85a9
font_02_sfnt_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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