Malicious PDF — malware analysis report

Static analysis result for SHA-256 e17914de584e3e7e…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 01:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7ebe91a76a288f7728737777d103ea6 SHA-1: 5a708cd36e0755c02d8005202f9ae12318477b95 SHA-256: e17914de584e3e7ec67e0d9fe947d2958442da12313f1ef3e6135d2bb4010cd7
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farm patterns, directing users to potentially compromised websites. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=ash+gray+gba+rom+download PDF link annotation
    • https://kop-trans.pl/uploads/userfiles/files/lajifumar.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613329276c557---12508641166.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/natezuxor.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138376eebc8d---67183433220.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/25808431869.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/41014266510.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/palowadowumufo.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/sigaravetotejapivixutel.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/tipirakavuris.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/51188037139.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/dinokavokale.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/43517621548.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/sodinik.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/22010895581.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/50346623486.pdfIn PDF document text
    • http://360global.ca/userfiles/file/voranabelav.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-11/images/files/jumiwexerasuxalo.pdfIn PDF document text
    • http://keitbg.com/images/files/fakutotogazibebu.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/12337957011.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f92b17223c---susigor.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/42648153180.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/fubimerikosuba.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/38079748215.pdfIn PDF document text
    • http://www.pvvc.cz/files/kolisuvalanizugisejavuv.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_off0000dbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC1 10696 bytes
SHA-256: d915dd8e2693d04b9599ea459c12de378e3055a655b28844d120a7ede3873bfd
font_01_sfnt_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 22380 bytes
SHA-256: 4aa648438e34daef6b6fb242682fa73eb348607a7dd86737bf1e647bb7c5e1ce
font_02_sfnt_off00012dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1