Malicious PDF — malware analysis report

Static analysis result for SHA-256 e075c99a23a30a30…

MALICIOUS

PDF

88.9 KB Created: 2021-08-06 09:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 07d71f7c0a489f7a50218b35c1514973 SHA-1: 83a60d6581ae2ad0a91cf9d7f900efe40b9c1403 SHA-256: e075c99a23a30a3053737e418c12e5f498b057834921a31543b039ad3ebfbe2a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://saleskerala.com/ckfinder/userfiles/files/japelaxireposimazaxubu.pdf In PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/18476424191.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/68632536042.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/bujekaxamubibifisiki.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/k3eh6paivctqg7ppepgibmh1qo/kozizekepemuk.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/78643916380.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805808ec773---lefewix.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/qo1esp2doctkdrrub6gjlagk7s/fafidaf.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/29280877464.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ku3mukad4pq9o26nl8pudcdac1/2644022832.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/fa295056fbd889878d7f20d36db7cc80/62503971665.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/26961835157.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55b09b1e8e---nurakisedemujorupera.pdfIn PDF document text
    • https://aaaxxion.info/images/file/xoredexivipogezuz.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/37f4bd440b92bb54d10ec5e11fd2b375/2548961202.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/j5cqu6n5n0rkh1hfsv31fgps59/seratuxinib.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609707ace82c7---80607518230.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/vuzugetaz.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdcac2a482---baluniwuxekegosavif.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f01f9a86a4d31f5b6ccdd175e9013181/malunoxinisibawafil.pdfIn PDF document text
    • https://slide-bearing.com/d/files/topudodav.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160abebf78f0d6---33407320157.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c9c0dcf77ab28af4addbc66e094c4d21/pojoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=babette+mangolte+chantal+akermanPDF 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_off0000f4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCF 18076 bytes
SHA-256: 76ba0a391628feab601c7c8c7ef93c7417b05b8e00a97f03e214d8e43107f48a
font_02_sfnt_off00013b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B44 10704 bytes
SHA-256: cfa15edf189e4d6685dead696d27183ea187eac7e69243adc8a4130433629543