Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cf2ce741832e6a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 00:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 592fe6a856536df9ea317582545a74b9 SHA-1: c58a63c086a39c6edd2de54bd0a1154c7cfa1cf0 SHA-256: 75cf2ce741832e6a9450220069ef1d208bb5993b8b36a119a9225a4dd8abd2b0
176 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm hosted on disposable or compromised infrastructure. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=turn+off+proximity+sensor+android PDF link annotation
    • http://groupkaishan.com/d/files/xonawozamomizas.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/uhe96ev2gelvprdv37dnamsine/79315262242.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/rezasivedo.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/51371904509.pdfIn PDF document text
    • https://esvigo.com/upload/files/30713298042.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/mebepujifuridevor.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///pojiburidutorixovuv.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614034898c7d6---24654806874.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/gabamigugulazonunefo.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3c15a7ff5---lapojuzuxoli.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/buxonepimisabusekagofi.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/gupufiwuza.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/lenojibikenunigo.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/refesibavuroteteza.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1fff4e976effb2c611e8a97e33dc43b/wulatasinivimivetofivi.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/91577940833.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac41e495cd---98539591523.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/sozuzivu.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/32007168879.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161454d7e12054---xurerevakosidi.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/98037254608.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/pujugupofewiropatuj.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/mevituxaviguwokul.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/48087063749.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/nizojugun.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_off0000d09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 17840 bytes
SHA-256: 737e26ee23d37b52a3f62cf45395a6fa3ecb5788f9e2f5096200232a93914acc
font_02_sfnt_off00011759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11759 10892 bytes
SHA-256: 057832ad81d3116a89015e985dd8c6e8a4c2a5069daef75b4494957a0a3cd2d5

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