Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d425d52763f3a6c…

MALICIOUS

PDF

108.6 KB Created: 2021-09-04 18:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9dc094d7d4326fa44471f1872ff2e02c SHA-1: 14ac9f3fd7b21f59c740ded2a299390a8caa30a8 SHA-256: 7d425d52763f3a6c7a976b0c9e4e2ebe6801848ac6e4352cf6cfad2c232c48b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript further supports the malicious intent, likely for executing further malicious actions or facilitating the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://simplehome.ro/ckfinder/userfiles/files/45266542109.pdf In PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f09f837c40---nawalufu.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0239c85210d094503677dbbb905d76f1/22795952232.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/luxeritalikaxoxonar.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/83321859482.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd8143c923---28497355039.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/9205112415.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/pajadoluderugewefidaduke.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/jijekumujezigutizif.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b414defb45---mubag.pdfIn PDF document text
    • https://cityface.cz/res/file/duwimowetagitilu.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/96252195928.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/80085362388.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/851a4b70857e5c009aa5099077b18ad8/10013508854.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/73318741541.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/fogowerofimedosobi.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/43260644701.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/5ga2e0vdpovo73n00dm42bjbhl/gopatofotupigak.pdfIn PDF document text
    • https://cooperspick.com/files/ninazupofumerixivorun.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd18282ecf1---77531205046.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/69445044187.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/478730596611c1f519fac5.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/i7udb42aal6aqpthij0m7liab0/fupidoko.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/da3305951f262d4bf8c450b274799ffc/wujozonapuzuxedela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=understanding+neuroplasticity+pdfPDF link annotation
    • 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_off00014083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14083 19088 bytes
SHA-256: d3bff83c183d15d5fa661a66d742e50132087a9456a5c3ef8275c6e3b2906413
font_01_sfnt_off0001725b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1725B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A72 11016 bytes
SHA-256: a174efb887baa5eedb682a3c2aa388b67ca41a8c164f6f7c171bca3383f86625