Malicious PDF — malware analysis report

Static analysis result for SHA-256 56729ffec91f28b3…

MALICIOUS

PDF

87.8 KB Created: 2021-07-21 23:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fa580f69676b6756f50da7d11ec29cca SHA-1: 7d8ea849609ab2bc3781a31ad7eef81655d4381f SHA-256: 56729ffec91f28b3eb7c862bf51f32048813238ab8b2226f0b39f9163c37860d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9587

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://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_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