Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2dc25cbc9e98ce…

MALICIOUS

PDF

92.1 KB Created: 2021-08-07 18:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 510183721821793cc31bf3b005d6e393 SHA-1: e0789c33f433e3c2a735df0761d5ca66ae593285 SHA-256: 6a2dc25cbc9e98cedf9c7df643e931a8914e79a294775b6d098212a41ea200b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=arabisch+lernen+f%C3%BCr+anf%C3%A4nger+pdf PDF link annotation
    • http://www.gdchgs.com/admin/img/files/41458733154.pdfIn PDF document text
    • http://qca.ch/userfiles/file/pozuto.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdd0c220ae---66998611506.pdfIn PDF document text
    • http://texmet.pl/userimages/file/linovinub.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/29fdfa8737339a25a3d8eb3b49c972a3/62637503355.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/03m92pp5us16k0pqcuu81gd1i1/69222982192.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/73312328587.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a0b425652bcb7bc49212065e850c44f9/nulide.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27403831027.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215735838994.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/07/file/dekilexokem.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b724fee7c72---62406250410.pdfIn PDF document text
    • https://airshow-bg.com/file/xefigiwajinupub.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca752356a1---68430453086.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/52358185172.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/texixoxolep.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/rimavirivujomide.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/5959dc7fcbf9b92b0de0320a0434d4ef/8797654738.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/802ae74078d4a4bb07928192e1a64994/pelokani.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160789511c5fd8---disode.pdfIn PDF document text
    • http://vinmexindia.com/uploads/gobizip.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/83d9b9e239ad311c662cf502df0e3c74/sofigetuwofifamow.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/75821ae6c6a4f1418b12c626068947d9/46392641605.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/a25rfv2frmofkipg4nd7bkkkm7/25564585111.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE1 11248 bytes
SHA-256: 6f9deebeb9dbe6213f87faf489c2969c4d592dc43880f31f66dc14ac78a71605
font_01_sfnt_off0000f904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF904 19248 bytes
SHA-256: 9f52f9a66939741ad7fd9eb5ed68f9239d3c31c81b8db5f1e9da12be3628d9a6
font_02_sfnt_off000118fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FE 18284 bytes
SHA-256: 05b82bcdb56a19b19056298dedf211e41fa5889da4460b5db97fdd49e27663a1
font_03_sfnt_off00014796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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