Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88c38dcb7abcf52…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 02:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 16a51364e8a4247115cd7673ccfd4bb9 SHA-1: e2005baf5f7e5fb88fc1c5ca6b9dd7570e82d87d SHA-256: d88c38dcb7abcf5293d1d986edd6f9d38d23e9779509b7b206dab0b93bfd6341
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous external URIs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather as a vehicle for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://garglob.ru/uplcv?utm_term=warm+up+chorales+for+band+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dfe2bbdeb---47288222587.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/koxikatumabarokowal.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/49055265329.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/xukijawuvetenijinevawum.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/12367632684.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/48481044192.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/donanesote.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/56096708123.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/nonoput.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/ziluzefinatedez.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/43669836873.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f08bf6230a---lawudak.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/vuzubevimadofuboze.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210701191231_7sbdiz.pdfIn PDF document text
    • https://ewt.cz/res/file/pekotuvutatizerewud.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/78979483035.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/34382271002.pdfIn PDF document text
    • http://vo23.ru/upload/file/69378923667.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffad4e41a2---fuwanatiwironavizojupo.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21719da42---69624339922.pdfIn PDF document text
    • https://cristalensi.com/public/File/gufaxomapudikufukofe.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8fa36bcae---96583898529.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/dowewivalobojazi.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/ziloxunud.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/69604198002.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e7b69a794fa1e3296a1fe8e0a1d10896/41228728902.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_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 17720 bytes
SHA-256: 517f40052ade362831eede5ae6764fff90adcb97947143745a79399f1193f1f9
font_01_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 10928 bytes
SHA-256: ee8e0b493f1c275e01c99a36f76edcfcf7a17a75afc70915d6e581a537df4652
font_02_sfnt_off0001253b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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