Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a92f6fa5613b76…

MALICIOUS

PDF

89.9 KB Created: 2021-06-25 21:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ce1af6dee581974ef448bc32a61acdbf SHA-1: f60ff8ea117e153f4edea5f150ad6345d10e9698 SHA-256: 17a92f6fa5613b763775514184fc71277cea4c4983b9c42aafdc91b9bce2ed03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://oniceh.ru/uplcv?utm_term=scenery+sketch+drawing+easy PDF link annotation
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/e2ijnhg8ec8g7q6epeu4kje7st/88839004778.pdfIn PDF document text
    • https://banghenails.com/upload/file/79495456386.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b04fed70d98---33303599384.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/dowazimit.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/64344113200.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/19873762148.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/pazetosanujesafolosikiwu.pdfIn PDF document text
    • https://artbynela.com/uploads/file/kixilowefavatijovaguwawup.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab3b12f86d---gugoxixepanubiket.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/32s3sbtmppo6fu0o30dj0as154/zajetazololajozofiwa.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/18456352690.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16097b5efdf49f---gixaxilaminiz.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/56e4045305fe0e2ae7e858e5401d7e0f/lirexizixotobelusozuv.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aba00b0b655---jatosapoxajefovot.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce3cd346e4---webubirakolimip.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///bosix.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086f67fdeb91---82994681030.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2e144cdb3bf58ab1d3c2f7e62a35e5a4/55524533517.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/26412188946.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8816061db1---jepogimogurojasepuveb.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd385dd169b---10230512487.pdfIn PDF document text
    • https://baptistfriends.org/media/15832759282.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d71e51647---towakegikubek.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_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 10848 bytes
SHA-256: f8d056141ee7a796af325a61159f15dc6f9e596a844b50fad24abff711c332f3
font_01_sfnt_off0001129f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129F 18572 bytes
SHA-256: dd564e7ca3cbc9f5555b586a07b608522143d8bb87ebce1b07fd3e98f96a6bbb
font_02_sfnt_off0001420d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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