Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3d9fbcf569f0e8…

MALICIOUS

PDF

84.5 KB Created: 2021-08-27 14:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 517161c8543f479181be2925b90fe7d6 SHA-1: fd2d2e7685a93e452eb52595058fb023c0f81e2a SHA-256: 6f3d9fbcf569f0e81408e57400cbcef2921c7e214c1375447152ceafa2988176
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8660

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://krisoc.ru/uplcv?utm_term=fastest+miku+song PDF link annotation
    • https://dentalrud.com/userfiles/file/20799420668.pdfIn PDF document text
    • http://gtshotel.it/images/file/12276462654.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/jobov.pdfIn PDF document text
    • https://artbynela.com/uploads/file/kixilowefavatijovaguwawup.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210619_2EDE063CC7A6CF91.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/e24ribitl7d12v7m310gmhivll/lelizim.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160982e33ee060---45737731130.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/91502658116.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1805e38f5---vubomikamoxadaza.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/14710794378.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/94362873187.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/7016615841.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/47422b11942386ac7a2495af02fb471e/dodabur.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/rfn7b5ehp2ofvbd10t8slnoctp/kisezewesebufonib.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/14508054713.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075dcdc05616---wajizagi.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/dalovadexasojereved.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/dasipusavoxesijaxewug.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/62510150886.pdfIn PDF document text
    • http://limoride.net/gallery/file/33837624695.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/gawulapiritetowiwikeze.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/56020220560.pdfIn PDF document text
    • https://samowar.ch/upload/file/rugezifalowawevoba.pdfIn PDF document text
    • http://vinmexindia.com/uploads/suwuwiteguzu.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/35745748526.pdfIn 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_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104ED 10476 bytes
SHA-256: dad6eca25697b1f13963cf1b1688ff73384f1bacc6797ba1b007b59c80fb9bd3
font_02_sfnt_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 18804 bytes
SHA-256: f795b9490253ef13ced5c479b9f49be9878013aa1a7cfb917e360e5b0640ffb2