Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4da25d739bb31e…

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 13:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6551420407069782bdc676cb46ec4206 SHA-1: 481a96dd80f96369edf35aa8e850f896e803300f SHA-256: af4da25d739bb31e601e02ec5906b295541d21b19bd5dae84a3e3fa5e34b74eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of 'utm_term' parameters in some URLs further supports a campaign-driven phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cructi.ru/uplcv?utm_term=comptia+network%2B+pdf+2018 PDF link annotation
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609234dee58b0---modadumobevewifazed.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/84984488804.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/pugewewaxivimotuz.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/94867208455.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098699085479---54869851912.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c4a386263---10603481286.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/10155feaa3cde9ab1e2613f3b1e1b7b4/52465078718.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/53712487817.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a24e2b12d8a---45741096315.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b32ac011f5---riredebazizewofuriveko.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e6641ce45d---nodawe.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f3033669313a0549994bade9c5d969c4/71462130796.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/327d9bdaa7c7b2d1f23a7879ec9334bb.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/nutotavunidamokepaf.pdfIn PDF document text
    • http://curtisfamilyfun.net/clients/e/e0/e02f67ab5b6879a7eb6c21a3163f7106/File/71076260536.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/7221955511.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/71239189403.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/13750687799.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/91695957451.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/1em4rbuamn12jgq404f2mgng59/sipolumosig.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/dubizoseja.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/59223486905.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0ba1da36c3df4d511fafc376a87cb689/38941711399.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5cc2498a6---19376329756.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_off0000d610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 11156 bytes
SHA-256: c0ffee4a538f19a5e921c1af5be87296cfded705882719565d95c39c5457ac6f
font_02_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 17828 bytes
SHA-256: a10adc1c54ccc9c4632639f1ef17c7ac717d8924f9632808b43b292d57cac9fd

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