Malicious PDF — malware analysis report

Static analysis result for SHA-256 909fa6de27725bc8…

MALICIOUS

PDF

90.5 KB Created: 2021-07-21 23:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d429187c4e7df93b2a0d49e844d31f8f SHA-1: 5976f926e962483ac5d5c4cb1bfa0a856577a9b5 SHA-256: 909fa6de27725bc8cb703b1046da64153c86b71a2b7693846d4020a696be3932
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://revucue.com/ckfinder/userfiles/files/39821789901.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/80713309941.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/44423655377.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210508130733.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf90cf6a43b---xulevowulekilesulifajisek.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e47a8dabe73dc23a1689faf9a6b4978a/kisem.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071905f73d2a---14478847804.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/34068800316.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2f5118c63---75000995970.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/53013a80ba790fb4a794972dfa7751ad/81856971066.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/8gjg8ul9u1c2aeshp2trobn611/malikokexeduvelaxilebola.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105300144551690.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/fowedudozejote.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7aa8c0be---92407354247.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/bowirimivemoj.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/muvojilemogobonikijoxak.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844f6b91ae3---fudev.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/54708fc0eb706b3db9699de38118ea7e/75943029420.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/losugazafig.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/botijuzakorajarifutub.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/81556025766.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/kabufawutorigomufipisuzib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=god%27s+almost+chosen+peoplesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 10660 bytes
SHA-256: 7a96d3d70f3b3123a1f874a8fc1e4e09d0222c6ec61470eae34888620d72d1c8
font_01_sfnt_off000116ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC0 17316 bytes
SHA-256: 27707c4b7ea4bbe251d25cad9d6388ced8b0bb26c4bb506ea485a94787f2321e

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