Malicious PDF — malware analysis report

Static analysis result for SHA-256 91edb660dd34e4d1…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 08:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3aeb256d162bed7f43a796b0477bccfc SHA-1: 52b430d278fec5e4b5f4e16c9cba9e04a93a4175 SHA-256: 91edb660dd34e4d12e135ef48b8c55316a06c9f225a5e956c9894e4e3bab8228
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URI links and link farm heuristics suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=libro+el+purgatorio+una+revelacion+particular+pdf PDF link annotation
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/kibokaza.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/93909421883.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/13028053559.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/fc9eb2f4df2c04773ec09c1bdb329e2b/18251934555.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/9eb180800cd62a782075b4f877a770e9/mafavupoluz.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/93665884204.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b71cc2208---gaxajujet.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/xelufonitopifedusaxodedez.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/wobujigubarewadetidux.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/walesijikav.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/57708707832.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/wubawiwisar.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/tupuzezojurelaguda.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eb4f8728d5---pulumajepazi.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/sakorowipugafejapagapanuw.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab10d2205---jologitigumepakukinojuji.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/huchkdavealk46ivljeda2deg5/1489529023.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/fbeebceba4d56a732a2f83b8a782299e/37031644451.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608befd021f5e---wijiwuzedawidado.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3576181315.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/ropisejobabixagigumax.pdfIn PDF document text
    • http://merwepizza.com/upload/file/76463290989.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_off0000dad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD4 10888 bytes
SHA-256: 8e22f027683773141bf4fcdfba6568217bc8491f4110a7e89c876c598eaacff8
font_01_sfnt_off0000f3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 18824 bytes
SHA-256: 3a71466aa6f268665e5061c62c58f77dcab01079be9c121077876bfa1cdfde67
font_02_sfnt_off0001242f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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