Malicious PDF — malware analysis report

Static analysis result for SHA-256 a450efc2b14db819…

MALICIOUS

PDF

77.8 KB Created: 2021-09-03 22:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 62e998ac550a157239e687d7139ce354 SHA-1: efba9e3b29e133f932440042250c77fe1211571e SHA-256: a450efc2b14db8191f4648c6ee268b8ccba9458a640caf2310d501f4b6131183
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the structure suggests a link farm designed to distribute traffic or host malicious files, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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://avandcie-automation.fr/ckfinder/userfiles/files/zuvosobulimu.pdf In PDF document text
    • http://modern-pro.ru/files/file/22656464492.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/bisap.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/25759925358.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/31233160047.pdfIn PDF document text
    • http://samtekelektrik.com/files/5812640800.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/90470004209.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608bedabef0f8---51634784861.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/62446842854.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/34796038942.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f600c2af6---zejepix.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/14610131884.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/g37lqrg706ft52ogmpkal0ja8p/leximewofumifowasaxu.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/nojokumigezipi.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d515e0365---fepivibegivifopapipofiji.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/97813366443.pdfIn PDF document text
    • http://edgecs.net/documents/81444397438.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/39e1b790be1360c49a91c00e99e8c8c4/65534680884.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/sobutukafoburuzinafojuv.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/77834992655.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/8200dbccfd2efb49f5df187725ec7a23/jugilixitadim.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/kozegolosegak.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/kidajekemaxabenawonaw.pdfIn PDF document text
    • https://samowar.me/userfiles/files/10450791743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=jenn+air+induction+cooktop+owner%27s+manualPDF 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_off0000cc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 16788 bytes
SHA-256: 1734dd6431d4ff0777f1f418c5962744d92e2df16e7efe8dd1d9228de4167619
font_02_sfnt_off0001100c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100C 10980 bytes
SHA-256: 3b4036468d465d64d4d57c03fc27717dec0d5058e0f6900ef091dc5b30514215