Malicious PDF — malware analysis report

Static analysis result for SHA-256 704304f68fd1a68e…

MALICIOUS

PDF

86.0 KB Created: 2021-09-02 07:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df8c7f55d238725ebaf4a419ea3630aa SHA-1: c9bd430d46832b6b36abc976246b10bec9fdd0a7 SHA-256: 704304f68fd1a68e9e560d498620796efded473a6774812808c81e05f6d178fb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on compromised CMS upload directories or disposable domains, suggesting a link farm or redirection scheme. The presence of these links and the overall structure indicate an attempt to direct users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://selfmadefilms.nl/userfiles/files/8148025972.pdf In PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210607_2B0DC3333CFDAD91.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc4dca20ba---xizemagipares.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a02f99e69b0e5fd271574c856a7c748c/87844858808.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/zoratulifejibufolekekin.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/tesamorugoko.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/ruxuz.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/17b1ab6ff49e775c0e96596dcb03dddf/sajokovujogikusifor.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16274545569876.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/f78dc39c326922e55f711d29413d5805/biruvivoliz.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1611af264133cf---39805192896.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/66200642818.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210725032414_gu2nhw.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/8c07f8a67743cdb589b7d13161fab730/jurevapinov.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/rokeduwodevamokijefub.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/xarepudupejon.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611553f347ca8---21471873966.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad37b0871a---gapoferufiguzo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d611132d7d---37873573517.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/50262494025.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/57207013646.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/duwodotanodadora.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/13313157978.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f252ed1dc8---votojituvewixiji.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/75700769705.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/v70b4ds84312fdopq2m6joule6/ronejozozanetivipal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+convert+pdf+to+word+without+any+softwarePDF 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_off0000ebbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 11028 bytes
SHA-256: d1ace8087185973548e95e96ba5c1648c37439d0917d809ab4e14b9834256fe0
font_01_sfnt_off00010562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10562 16808 bytes
SHA-256: b904c3e4bc5688b127bfc760da61522d0e31e55b2d4ba560aaa9a7c8e2c4fa08
font_02_sfnt_off000130dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1