Malicious PDF — malware analysis report

Static analysis result for SHA-256 c119f4fafa8dcdfd…

MALICIOUS

PDF

75.0 KB Created: 2021-09-03 19:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b274c3478fc679000a0ddb6f6b614b4 SHA-1: 153df466b869e80abea9d56eb3de35a492e59b9c SHA-256: c119f4fafa8dcdfd6abd85ffd638ed1b5f9495cf2bda80009d46bc0b329b2c3e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the link farm heuristics and AV detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://chithanhplastics.com/uploads/userfiles/file/xorerekowoti.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b97819aefdb616f17c4e9f59c5f9ee8d/73163708877.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210615230017.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/dufer.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/maxepasuwizir.pdfIn PDF document text
    • http://kasargod.net/uploads/file/42055304967.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4e169c2c7---73747915856.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086f3cdf1ec3---mabajadibonapafa.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/uqm64fs0ne389dbafecsjfgtgp/nuwenewoxoxusib.pdfIn PDF document text
    • http://imoroz.by/upload/file/53810866346.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/rikatujawebozusemetu.pdfIn PDF document text
    • http://scholl2021.com/clients/1/19/19bca4f76d5065ca3bffbfc1c67e7925/File/13596081874.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096528e88d38---9633760831.pdfIn PDF document text
    • https://ubranni.com/uploader/files/wuzodi.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/10468918491.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/gipoveloxoputuxagexovuro.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/94819112303.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/guvotopedowolazirowivom.pdfIn PDF document text
    • http://unsersohn.ch/images/file/4252796200.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3eb9ba491---nodob.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/7e1f9251d879c432de7a82ac7b50b306/sofajegenejofoz.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/45573227.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54ee22e070---nufoxeduvifararuvubixad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=nootan+isc+chemistry+class+12+pdf+free+downloadPDF 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_off0000c038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 11236 bytes
SHA-256: 8d860100cfc8398d3bba29b706061522852f55a43e45e814c523cc07ac6fd24e
font_02_sfnt_off0000f2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 16588 bytes
SHA-256: ff9e15444007c71ef910a2e0662947a47fc38e67367a3b559bd74270d5aac3df