Malicious PDF — malware analysis report

Static analysis result for SHA-256 1028414270a7c95b…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 23:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b3164311a29704a3b0fcb0049e4cc402 SHA-1: 311895df4c314190d9bb0f31efdee884604a1427 SHA-256: 1028414270a7c95bac689c32b1b97b053ac9221b6fd08e8ffda0f661cf189cec
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. These links are likely intended to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://infrive.ru/uplcv?utm_term=tubemate+apk+original PDF link annotation
    • http://actlogistic.vn/upload/editor/files/44259401752.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/b3b2efbbfb1920d553f211f4a3857333/lepakefutamomuzog.pdfIn PDF document text
    • https://krossi.ru/images/content/files/nexodatuwigamonerulela.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/36578631813.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109071228282200.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6f1b2869---42123950985.pdfIn PDF document text
    • http://alltechsro.cz/files/kudowi.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/tijotalepesizidew.pdfIn PDF document text
    • http://poiskvod.ru/images/file/88912543162.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/jetapokaduzedi.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/misimuvaxetuzi.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/54706770863.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/kevawamidejapo.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/9512026849.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/18789231318.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614138bd837d7---wizonuvibilaki.pdfIn PDF document text
    • http://kisito.com/userfiles/file/33435552374.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/39780522320.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a73eae75d---28086771160.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/43418240869.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/xukovemufinexanezele.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/18524061726.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_off0000c3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C0 10720 bytes
SHA-256: 1a72e508a24d9d338b4f6b279b31765c1f1cb67e87f8f821050736ca31920d97
font_01_sfnt_off0000dc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC18 17200 bytes
SHA-256: e50a9747df907b3652f204bed0cf4aaebf379cfb44e3ec6497bb1071dae1f420
font_02_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1