Malicious PDF — malware analysis report

Static analysis result for SHA-256 287dcba7048cb4a6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 03:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2fa1121920217a171a10d1a31c9e805b SHA-1: ab265de7e3e57a9c18dcd9021bc123cd771c7b95 SHA-256: 287dcba7048cb4a69b717b63f1595a5c829351bffbfbb053955f7005941c5285
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to potentially compromised WordPress uploads and disposable hosting sites, likely to distribute malware or phishing content. The presence of embedded URLs and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=android+1+apk+games PDF link annotation
    • http://liily.jp/upload/file/20210916093502.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6f767c84f048414018ef67f53906942c/fejubowamokugolimenubaja.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/45026071851.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/40524730583.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/takagiwiguxib.pdfIn PDF document text
    • http://belst.by/upload/file/nazaxajukav.pdfIn PDF document text
    • http://temple.mo/userfiles/file/1154954346.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/96422643538.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/godikitugisabumubo.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/xisotota.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/tonajabopewuvixemovuzeji.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/lidur.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/67757494220.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/151455347131.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/xetilazimo.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/u12b7qujihmd6u4qfkr2mfe6dt/24030556941.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/vasepexugarewopizisup.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/fepepajofodovazogari.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/potenewixajijiluf.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/42391342319.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/41650696679.pdfIn PDF document text
    • http://haai.org/upload/file/40054813855.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613362790fd1b---41843144055.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/23474515989.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/45632002012.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_off0000d942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 19492 bytes
SHA-256: 1a1608fa997b0ef50a54943a84ccaaa93f1e07838b263910e3cee1070104ff62
font_01_sfnt_off00010bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12409 10716 bytes
SHA-256: 6a18fd80eda886533166123450b580e8ee9bed1de7667d6c2e6994db01602048

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