Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cd3343d75e82cc…

MALICIOUS

PDF

76.3 KB Created: 2021-09-07 22:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8702fba6261441a2c15ee07f50c35222 SHA-1: 6a030975a00ce7674a1007427f263d91178b458b SHA-256: c6cd3343d75e82cc03ad6491333d7e6ecd808e62b68a1d62ac47264e3b95a2fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external resources, many of which are hosted on compromised or disposable domains. This suggests an attempt to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://dacinsara.ro/fckfiles/file/takewazelokag.pdf In PDF document text
    • https://hse.tw/upload/file/16615004002.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd66e9e5dc---15306819088.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae34fbe434---12417626184.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2111b74b015d2a6db4b712aba1ed04c4/92929440436.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/27801610848.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/katukepujadawogiwev.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/debiwunujubudesezuxu.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/80885880461.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c66e14953ad---zidowiwegubugujof.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f8e21a2b39df35cab1b602225816e0e2/66931849033.pdfIn PDF document text
    • https://digireg.nz/upload/80999094267.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/tudedipaxala.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/56514857488.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/27430110902.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/302358408126.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/6fa3e6d6d8749678058b99e8f1ad3cc8/nozixunutokukizalufi.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e903a705a12---94266221266.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/16183691070.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/purasisutijijanenapus.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093050412420---49931952880.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/mitoxisej.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076047149d48---pufudoxotisomasefanefusus.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/3o9e4mj161f37k2das863u061k/titixab.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/xifowejuribekavadewow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=properties+of+3d+shapes+worksheet+year+3PDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 10912 bytes
SHA-256: 8fdc586d8836d6cf14101c67c089182f4a063946687de626346f64edda8eff7a
font_02_sfnt_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 17140 bytes
SHA-256: 17a04bf0bf01cd36e47e73052d90419aff146a4a35cfc2d29afc4a114bc9937e

Open this report in the interactive analyzer, or submit your own file for analysis.