Malicious PDF — malware analysis report

Static analysis result for SHA-256 b314d7b322ed4753…

MALICIOUS

PDF

74.8 KB Created: 2021-09-26 18:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: af609589915f3db28671cab92dfcdd1d SHA-1: 4eb738c50f03908f0b9fdecd31c1d522055740da SHA-256: b314d7b322ed47537c9bbc8ba960d79dc5f20e2ab43e256e1aeac8817dc26a54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://philabc.ru/uplcv?utm_term=riptide+gp2+apk+uptodown PDF link annotation
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134fccfdc9db---xojilukunisa.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/63678524491.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/kodadexosibinalolusik.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/81967518817.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210902125201.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/11989104883.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401ed558774---ligugirelezobiluvipuwu.pdfIn PDF document text
    • http://domexpo.ru/up/file/94634051263.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/luxabaturigurolan.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613182877517d---91956566438.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f990bd899---88891219482.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/48609036796.pdfIn PDF document text
    • http://plncse.hu/php_data/file/70801154164.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/20595764637.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486dbfbc827---65823240632.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/tukegefitarowitanipez.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/befowu.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/57336217768.pdfIn PDF document text
    • https://kermanrooz.com/img/files/zamesapapurip.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/satarivovabux.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/34151400501.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/15971621430.pdfIn PDF document text
    • https://medius.sk/userfiles/file/fokiwasejuxonavedalagasu.pdfIn PDF document text
    • https://hotelcorona.ro/files/sivagadazitidiwawumexuf.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/nazivumipex.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC882 15128 bytes
SHA-256: cfeeb6680e5f8180542972e1c435c48fb0ac9686c9a8bdc2c8c10be6e402622c
font_02_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_03_sfnt_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 10696 bytes
SHA-256: 039d6074e7cccc17086a746bff5a4dc4a1fedcafe8087d23eb5f88de7458bcb4

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