Malicious PDF — malware analysis report

Static analysis result for SHA-256 48cc1a4c491fad26…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 04:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 20300d54be5259a5cfbbca0c55fc324c SHA-1: 8257d1ee56f871a5f4a3786e4a0bfa316042b141 SHA-256: 48cc1a4c491fad263e6b42ea26d7a77dccc2113b1d6aba90fb14399d4e07de34
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=fun+run+4+apk PDF link annotation
    • https://giltmorestukko.hu/ckfinder/userfiles/files/kovare.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/6d6ba02ca87dc30d04f35a1c2342d0d3/79497724410.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/57825602609.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161382c1d1062e---jitaperononelifuxuwe.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/a391c0291e4f322239f64cd8037a8482/garigivekedavorukedi.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/burat.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/45722748208.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/58331753110.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/xazavokor.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/47559714765.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/90258358708.pdfIn PDF document text
    • http://le383.com/uploads/files/buwutanid.pdfIn PDF document text
    • http://parfumland.sk/upl/rudujebuniwavofarudif.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/67197417243.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/30448099130.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/vorizafikosefomevejazajab.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/12411340297.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/60985373389.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/pobosakazimutuz.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210905120146402.pdfIn PDF document text
    • http://hkalc.com/userfiles/97626102267.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/lerataxakejubok.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c17e10a9f3dbef69aae761683ffa4ad7/77972888242.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_off0000d729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD729 9836 bytes
SHA-256: e2e58f2f91d57a123e073560fd7f9a2b512436dc3b7eb8d784535f0d8fb9c579
font_01_sfnt_off0000eccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 17884 bytes
SHA-256: 3bf1a5b582ead7a0601a434dea6daa08b44ad0667e7d6290af3a243f847551d2
font_02_sfnt_off00011aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1