Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd571d0d98932322…

MALICIOUS

PDF

93.2 KB Created: 2021-06-30 17:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3599ace2e4ccc883dbb035b178e802f7 SHA-1: 21ba01e64a60c815d4dab2c0d93bd35b5221c2c8 SHA-256: dd571d0d98932322439d79ce1f8a3e7383164f6329dcbc12b3d93af0b18fadf0
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent. The primary attack pattern involves directing users to potentially malicious or phishing sites via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/91111303839.pdf In PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/nojafoxigozi.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/1689209243.pdfIn PDF document text
    • http://beiks.info/public/file/kofexozuj.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10cf011de0---pazugukatemejifalalatega.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/5744970033f23979349ad1afae7277ad/57834111041.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/m6duopb047d553ftbuf8oe6fh2/18589804005.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/8fi9lh9f9n20k3l79q133gqklb/45001246103.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/65107632189.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/saxikarisusigavamijez.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/2576a8e9bf3ff36f6c7b3c11500c5857/60140013531.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/duohh6n9um9ffjom119b14jih6/73507885799.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaef826c8ed---vovor.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/7qgh4trvb498dufd55m164ufch/49438385478.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/0a7fea9869a60bf5911e0e3df1e55fa3/gutov.pdfIn PDF document text
    • https://cmoretv.com/userfiles/purisufevabesogi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/eidr52qc0qalc7erhtpeaslv5e/13312547595.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c477d9d58a6---39503704572.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/7n9a3rumi95s9osnb1fpjpkge0/wopisuserataga.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/23893525983.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/pdsv8g1hdukp9iac4cu49eutjc/juporotazugeb.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://ahxxzx.com/userfiles/202106/file/noloxevofukovatolamipaki.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf9fa3bde---53014243587.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/7jddtkrqoaqntn9o432h1am5qi/46177502785.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cffe788ad5---vumafisenobujiro.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/7770dc2a95db1dcb554a526654ad8afa/90433839412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=westmoreland+county+prison+inmate+listPDF 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_off00010987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10987 17064 bytes
SHA-256: 9e2ce06bae1320fbde082bb04ef64d51818f862db7aa7287435f672a837f12c6
font_01_sfnt_off00013609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13609 10884 bytes
SHA-256: 5b3ee03a2674832cfeed9d7f02df140f4a0b6ddc060ad0acc29c89f04f6de1fc
font_02_sfnt_off00014f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1