Malicious PDF — malware analysis report

Static analysis result for SHA-256 db75df45dfe01939…

MALICIOUS

PDF

91.6 KB Created: 2021-08-11 08:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cee27463f84c99f21092ececd23c9f68 SHA-1: b745d6e2c905dc86c95bfd126f76efaec67bab55 SHA-256: db75df45dfe01939e7a05496fe5e0e16d38cf806b6013d9804ac23e033e1d80c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to various websites, some of which appear to be hosted on compromised CMS upload directories. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://crysiq.ru/uplcv?utm_term=is+metformin+er+500+mg+recall PDF link annotation
    • https://ascinfratech.com/clientprojects/trading/file/64611111805.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/jemaruwovoxuxelutikaz.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee273059d8---xadizusegufivefunifim.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/jijeridunogu.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/mubaparejumub.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/27782441240.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecc735e77f---nitubatavexekuxub.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611135cb195a6---43068162255.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc1089260e---61689031188.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90ac98225---wosapukevezamiguvexuj.pdfIn PDF document text
    • http://k1a.ru/images/files/file/15445575863.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/50848143807.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab07ea0802d---voveneluxududizamuteni.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/38559642260.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/1761168387e5beacb360bae4d5fd5ae7/jomususuw.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a1fcd212---zijikukubovapazas.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/21121038874.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/pufegubo.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/rizired.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/10b8ae3fd39976fa97038019f9695d61/79819645214.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/gjo5ac5jsa5appmjresshal0vi/lafixutin.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/95556231164.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5fa358bf9da4acda0696480880c0fe8b/89026916764.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/12471274320.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/69647997381.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_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 16612 bytes
SHA-256: 5c87c2a7bfdc8e038c2d164fe759dae3912a79200807b7c9cddd83c6b424e175
font_01_sfnt_off00012e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E06 10888 bytes
SHA-256: 544044d2040286a4b5fbf2a5cd3822c3a5c16c15f8c9b7909608360b89e5aec9
font_02_sfnt_off0001473c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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