Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fb16c88c898fb0…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 20:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 534d8e39f05edcc53bb9abfef338a0f3 SHA-1: b89086f8caa8aeea5a921605e4770909c7dc753e SHA-256: b5fb16c88c898fb02fe2e5b61ade7a91ab4ade0b14b37cfb320b4df7a1a78f2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/mdkvlu6l9gqp02egtegqjp2h22/desezidela.pdf In PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/51d441727203efcdbb6bbace3294b4c2/34782326817.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ff8443ff87d311ea8463be8da70636af/18578615257.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/r1f6ljjpenlvgghrh6h9s6m153/34296934700.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/35568750182.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/41127947452.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/860ddfb1fab4390a0762017f847a1dee/31870362239.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afedfc461e2---nuvoluwopuvakuwisogid.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a562f032ff98c2dcbd9ecc92cab4e4a0/nomoxa.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/tuzerusepupopowexote.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/naxuxufutoledutebu.pdfIn PDF document text
    • http://onboardviaggi.it/themes/userfiles//files/vaserorov.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d35b8e54255---bisezawisokekamifug.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610574678518c---25475081999.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/834215d755a89206cbbac0bd0114fa26/febetufed.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/zisosobujapekeluro.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/sinojisivapezovigamagedet.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd3a21bab3---22212676122.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1889929cb4---24755666268.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/66984308614.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/003f61636002c92ff2829bb009bc3f89/7681433417.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/66719688726.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/temekuwor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=lobulos+de+la+corteza+cerebral+y+sus+funciones+pdfPDF 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_off0000d498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD498 10984 bytes
SHA-256: a3a15027f6348b1891b30f7efca35be2bae7d275548eee5fe00ef2dafdeca464
font_01_sfnt_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 17920 bytes
SHA-256: 961b8e174ae02175559c127565c3e293fba47707b90f7ce84ae31faafbd49385
font_02_sfnt_off00011b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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