Malicious PDF — malware analysis report

Static analysis result for SHA-256 a611fa00dc6c5b3e…

MALICIOUS

PDF

87.3 KB Created: 2021-09-18 15:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e381f26c690f112c45ec576178b51d4 SHA-1: 7a7dd0ccdf286541af21f10e8a417efeadce6811 SHA-256: a611fa00dc6c5b3eb84aecd236d566f99c38def7f93c5cdb4d923853d321a61a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, potentially to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=how+to+set+screen+time+on+android+phone PDF link annotation
    • https://serihosting.com/calisma2/files/uploads/dejezigumop.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/e80da8ed74d90e4f11500fc9b3fb1742/10784373412.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161388b2883554---81872261922.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/9857806385.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1631841433990649467.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/e3drt71l9o9h7r2ljrh0ahllmt/43414731173.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/titijavowekorop.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/gufimuvonipa.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/zototasevijosasiva.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/natenegetenulunovifi.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/39188909288.pdfIn PDF document text
    • http://accronline.com/userfiles/file/gijaji.pdfIn PDF document text
    • https://questyme.com/userfiles/file/ramorag.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/6061434330.pdfIn PDF document text
    • https://hgb.se/filer/file/negogisibalar.pdfIn PDF document text
    • https://latework.cz/soubory/28873689251.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/1679999096.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109180504133371.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/9u2ubbvh1dhamecriguegcj6qe/73137427927.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/dupodasobegunolib.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109120902196240.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/q91qlean6hm2dvp9fs12r2ngv2/sujonilojen.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/bavik.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/83454760502.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_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 18312 bytes
SHA-256: 85b104ba2082d4c22b725acf135a61c61d3d41c36604829f05d5d7bdac338414
font_01_sfnt_off00011ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECB 10808 bytes
SHA-256: 340d3bd2766ff42cd51659783ec3db70f7ff8b318a62383c2abe90ed07546866
font_02_sfnt_off00013786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1