Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd4f4142ae9213a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 23:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2971edfb0473592f8d0310e2ad324234 SHA-1: f4215b3a2404b33dd2ac9c6de7ba029309f334f0 SHA-256: 9fd4f4142ae9213a400324c0ad4058c880419a57ec09dcc0329143d2879b0367
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may also instruct users to open a password-protected archive, a common tactic to bypass security filters. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pixomot.ru/uplcv?utm_term=cambiare+account+google+su+android PDF link annotation
    • http://botosani.ro/img/uploads/file/43442699726.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/jatuvaveliwinipajo.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/h3rr1cq1ulvkla03e9mt0obg6q/tatikitetimufavibobilexil.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/kojogabitavusixukawifa.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/pogegof.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/91888453498.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/49389890153.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/vozevijojonubunekebevigiz.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/favitewaset.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/3beadfab00c6088b14f026921d4b82f7/gateferosepet.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/3cdd2f5785ed697e037e2c1da1a5197d/bigaramogolezifofirakufad.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/97064379118.pdfIn PDF document text
    • http://zuche0551.com/upload/file/vifofa.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/kijinimokomalomiwa.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210907_080030.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/35397375395.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/45221972662.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/firebekarewi.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/rixik.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109190455398064.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/kaxadigedidedizokix.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/7295624965.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/gusifipotenukujakujegega.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_off0000d57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57F 16996 bytes
SHA-256: aa244108da0bead7dacd7d6ff961fbe819c1ca5c87851a1bba3fc1d985766328
font_01_sfnt_off000101fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FE 10984 bytes
SHA-256: a415cf4e94d12fe4751e1dd7bb3c934d61224bd7f3029fae3717b774d7ea73d9
font_02_sfnt_off00011b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1