Malicious PDF — malware analysis report

Static analysis result for SHA-256 413d69aac3422cb2…

MALICIOUS

PDF

91.7 KB Created: 2021-09-02 10:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: afb9a2f050846bf6d4b4f35c04c048fe SHA-1: 661e31c4497b623ca685d7b8fe88fd35a2b23419 SHA-256: 413d69aac3422cb271ccc776fe94eefa0a57838739864cb799bbc8a1da54785e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://bobas24.pl/Upload/file/tasogigenivug.pdf In PDF document text
    • http://jiuxingchaoshi.com/uploads/file/260749348230.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160856d0c1d7d4---gizuludopabuwojuxipe.pdfIn PDF document text
    • https://laser123.com/geektic/files/magufurezubefos.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210801195116.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/11136347978.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/60134534759.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/62178252214.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5d421dfa0---bumexulip.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/muxok.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7efa2ef55---27402968032.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/80071619630.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/gt6ilktg5bio6t33gg65oj8grj/22539608040.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/xigekasomuripobasibidolo.pdfIn PDF document text
    • http://ihdbd.org/upload/files/57391815898.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c66b48a0cc---68286626686.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/2e7f1a4a34db8507e17a23aae238fab4/54272505509.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/16087310082.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/pasitugesad.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/zojelujenezekewedo.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5c472b1ed---wofujane.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/besubuxuluwu.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54501870400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sugar+daddy+profile+about+me+examplesPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/72949636766.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_off00010107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10107 17440 bytes
SHA-256: c30d7f7a370e9177eef059117f66cb172bb6b5df347c532f3fe468589433aa67
font_01_sfnt_off00012e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5B 11268 bytes
SHA-256: 37260eddf275fbcbcea576caa17f065503b78f95c45cb0fddf8ed96af4ab603a
font_02_sfnt_off0001486f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1