Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf52b4d7520a47e…

MALICIOUS

PDF

97.7 KB Created: 2021-07-15 10:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0dc3a7ffa4996b020fa8e837100ff70c SHA-1: b53e05ba95c6d9634a5c8ea71ce6f68185748cbf SHA-256: bbf52b4d7520a47e8ba6e8c8e525e10e114b51695a649072481b5138f6dd7b7f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics point to the document being a link farm hosted on compromised WordPress sites, with numerous distinct hosts and URLs pointing to PDF files. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16074758ac358a---80745005835.pdf In PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd34c141e5---kubosefuludoso.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/wigid.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b87976480---zoladusigubugufijoki.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/75566306937.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/gurewaxefif.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a31834439---jaronapuriwuxutaburovu.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/18880948081.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082043f39e01---filakura.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/foretikoxaxivoda.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/38274155843.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/51818403542.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/pumrhpr7f6ku1hq3odvva5vc73/94799804055.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/fdf8njcp9d77v2tk6rjniv6gr2/73794820742.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/witajagefi.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ac306ea40---dalezudumolox.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/kefagolexa.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f54bbd2c---65675917203.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/bcd78c4fd852579c51a22e57e6db76db/libenijobalemofid.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/fuvita.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/patebek.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/addf09bc04bbe2cff4e6eedfc60e11f9/91453432161.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/2bac17b6e847dee2e25b37168f595b15/58547001420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=verb+for+choicePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 9964 bytes
SHA-256: b1b759015ced5ced6b6eef8a48b4cce4d1f34c63786ec8fb5022d8a61baffbc8
font_01_sfnt_off00010d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9B 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
font_02_sfnt_off000116da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEC 18876 bytes
SHA-256: 267d4d4848db79e698e9ced65bd5d368beb6c731440af861bd3d34907cf2b3f5
font_04_sfnt_off00015f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F26 17160 bytes
SHA-256: 0031c3c2ba3b90d97080a977e9401a565477d1436ef4c4b456ff0784fff818bd

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