Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f3ed1f16199f52…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 23:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23de16ebb32e17c724ed1a1b96265cae SHA-1: 6ae2240ea8191b136d85e5a91b82dc8968cb6cd5 SHA-256: 23f3ed1f16199f52c0418a1f24d8184b5fe275f5d5129c82ebcb1171acd23ffc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=sao+md+mod+apk+unlimited+diamonds PDF link annotation
    • http://protectakoteasia.com/ckfinder/userfiles/files/vakaf.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/84346194263.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/60873692790.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/3fh2rc1gluvksd9sgptak45oj5/mutenesopo.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c8228aa4c---94260379172.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/59600061041.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/52961676775.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/41197227475.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c668b16a3---fivirafewetoxolajadewe.pdfIn PDF document text
    • https://gdaniec.com/upload/files/84728713414.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/11253762339.pdfIn PDF document text
    • http://mlight.cz/archiv/file/kuxidubedoxi.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/80555350721.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/85667270462.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/kokofonevixerurujogu.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/bedizadelelibududatogazo.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407eba45e18---67282463143.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/47764742230.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161389ca4db784---wovekuzesorafusokela.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/70446710036.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/tufadulej.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_off0000d3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BB 16876 bytes
SHA-256: 462240e59e4be9fcc80b2b700fcddfd3e8ff88a9fd5445469f9d2cee341f0dd3
font_01_sfnt_off0000ff6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11786 10720 bytes
SHA-256: ac85b679552f7129000c17622422b398238ee47e1d32ec0d4ba9c6fe80f94ea1

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