Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4dda752b93ad2b4…

MALICIOUS

PDF

81.5 KB Created: 2021-07-17 09:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a4f855fef94dff8c4258ed1657cc2f94 SHA-1: 41ee5fc03bf77d41247bd391c9daa04fffa36138 SHA-256: b4dda752b93ad2b4bec78e53b1e4322ad6bcb82f2022a96b0da2c5f82e0852bd
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

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://irisapp.cn/uploadfiles/fckeditor/20210524/file/16218663646261.pdf In PDF document text
    • https://liniagdanskzydowo.pl/files/79945590036.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/02f179537668c768285bac729ba39a81/97107133672.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/93585136144.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/neritafejigilevesiwiv.pdfIn PDF document text
    • https://electroagro.es/pub/files/92700857578.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/op3benlj3rdmbagijhomuv44nn/xunuloxezumubupepulujon.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/32118693878.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/2516115611.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/14598854726.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/04abcb547949b7126e76c295085e4f89/50679896240.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b351dfa53---58882725156.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/3471623775.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//katujasufovazulu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3aacac4a8---38657517356.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/bavinamobidogofer.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/e5e0f47e51572ce07f4bbb34ffddff55/raxanefovakiwaj.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f7c409400---54195766329.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aaa1015a4---datenotejunafiwate.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/a36fb3c369a2004557732abfb85b62f0/40860680573.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081388395700---bagobozisa.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/rowudizulonixizem.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/gujud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=adding+and+subtracting+integers+worksheet+docPDF 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_off0000d6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 18188 bytes
SHA-256: b6de6b7b14713863eeedbebcb11d56f4ff08c93370c7b4ac9d527cccf8d08e23
font_01_sfnt_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED7 11000 bytes
SHA-256: 435e7c786b3666c5904bbee489d2a18516ecf18ee6067d1f0d6fc8d98fc3938c

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