Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26f147d7400ff1b…

MALICIOUS

PDF

78.7 KB Created: 2021-09-27 22:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 99786338d6d816fd3195a6eab4fb2a74 SHA-1: b1335d8f4aded9a8a36969c1d62cbd37ab62450f SHA-256: f26f147d7400ff1b05009430fed0ca8239b476f9d3d52ec9afa2b2d41a5972d4
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external URIs and is flagged by multiple heuristics as a link farm, including compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://irlanc.ru/uplcv?utm_term=king+of+fighters+98+apk+download PDF link annotation
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16151cc5a6193c---wugikutobinitimakutenumi.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/41397147256.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/bujinalisipozebijiruj.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/74533194340.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/91e8c48c64c3c6e9b23573413aa51530/92271367199.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/puruxoxevijiwixowivu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bac56fcba---lotatekixerenizu.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/perudokakiximodajubasut.pdfIn PDF document text
    • https://airbays.com/userfiles/file/nizafile.pdfIn PDF document text
    • https://scalper.ir/data/files/file/sisuzim.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/2vuhiqg5r96j2pfpi7dfgtb8sg/jarakesapelapulovud.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/wasomoverewusot.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/bevatuwevupalubapetonejuv.pdfIn PDF document text
    • http://profstil.az/userfiles/file/bofozulonure.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/58m64scte8s4evf32bd0ebjo44/30834780334.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/38427644882.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/besiwapudimibabuponurepu.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/8132184532.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/67584089001.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/ginogafugotikid.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/vesujiwotegixopanaxol.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/7a1a3627eb6eca5e99b1500d03d92216/66574067107.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/rijojemekajaxenolaguzobij.pdfIn PDF document text
    • http://klemanpince.hu/files/file/fedawibufofagoj.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_off0000c371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 21176 bytes
SHA-256: dfe30b5346da96d56b501115f9a781318c8fad4badb85823fd5cf914f3b74723
font_02_sfnt_off00011294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11294 11320 bytes
SHA-256: 7fea1f83fd95635b3eeecf75214feba7dec386000732c52ae0324af73d1ccf1a

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