Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f947e7f4b02123…

MALICIOUS

PDF

71.1 KB Created: 2021-09-20 12:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4a60632b18879d0a70f79b766d5af79 SHA-1: 0172aeb34eab08abc52d94c19593383af203c68e SHA-256: 44f947e7f4b0212301facb7fc6146bb6b42b26e62aca456e4c82bb332a6bc8aa
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, 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 CMS platforms. The presence of numerous PDF-specific link farm indicators suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=firestick+free+tv+channels PDF link annotation
    • https://cakkue.com/contents/files/pevugegixosetun.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/wibuvosa.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/wujugef.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/budewapixakazozoxaz.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/ad3f5da4a8b06693b1029f580310e8f0/ruruxanuwojug.pdfIn PDF document text
    • https://conrays.ru/f/data/mabisu.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/39388046859.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/fujotufazewa.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/durotagakawagelo.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/60454379550.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/gububisoritipikop.pdfIn PDF document text
    • https://oferta.lt/i/File/rewufepo.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bdac86f8d---niponabogemapuzitasitixad.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131733499ca2---94241809293.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1fcb7b3779c54d2d3267c04f269bb9a2/vesosinabedutezasokuwamu.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/67343625033.pdfIn PDF document text
    • http://videocycling.info/files/file/zininojefazutoge.pdfIn PDF document text
    • http://zenkatsu.dk/files/wugavokevobebizovo.pdfIn PDF document text
    • http://retailcop.ca/files/lexorena.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/0c8003ea0cd74d2d67b65d08fee174a7/mukulefobilare.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161373b2562cd1---vuzenubebenitoruliladebik.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/vobakaziwev.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfacfa0d1f---velejumorejena.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/29502239754.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/9879221525.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/60370982868.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_off0000b745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB745 15756 bytes
SHA-256: 159447697bf7832a41bed94d87e6c101ce9cfeec13b08df59459579001f05b68
font_01_sfnt_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 10448 bytes
SHA-256: 46d1579601bdbf60b81a7652fbf8b4782832875ccafb68338dc5ebc50f2f4362

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