Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9c8f8bd496bea9…

MALICIOUS

PDF

123.0 KB Created: 2021-09-07 12:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 58fd615fd7f3bd41e423e6ea95aa42ed SHA-1: 617aaf10662f3640207c10a85122bd48773701d4 SHA-256: 7d9c8f8bd496bea9a0393c6222a4db25f142d79d4caeb78649f7f6e8f7c2ee46
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9772

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qo1c8e92h20hjlruqk2u90theg/80284387254.pdf In PDF document text
    • https://alperbehang.nl/userfiles/file/jetokatadomakawuxijidaluk.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/f11118b2c5f57b826b6ecac2fbf09de3/31338686772.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f441c9461---xujulapazifexusubaki.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/6573220692.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/9251120657.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e85bc8e9d447d5ba3c79793782a7f003/64042550863.pdfIn PDF document text
    • http://burchiellati.com./file_fck/file/fodumukafonexaso.pdfIn PDF document text
    • http://medica-brno.com/files/lujaforaliw.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/kovamanedumedudugutowaju.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe8993aa53---vokawi.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/31015242761.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/54055396664.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/87c721fd5393e184843b6b2e79fa9a37/romodaxexowasebep.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/r98kr1p68vp9oitll5misk5dv7/97849582946.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/9183463960.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/47610297505.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/21874813449.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/34b0457e4a055225dcbad72c794e2ea1/90456286923.pdfIn PDF document text
    • https://securitydm.net/slicice/file/gojanoxupuro.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bb2cbf006---75984884490.pdfPDF link annotation
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/650d10bf85b92ee5e5729a31485ed332/8154186999.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/54328558201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ms+office+powerpoint+2007+shortcut+keys+pdf+free+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D53 29388 bytes
SHA-256: 6a43ea546b169781d8b966f017f08bb88d94ce139f880c870586a2b8378ed031
font_01_sfnt_off000185c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185C0 11396 bytes
SHA-256: 491d7474f15abf27b772a78f169d9dced8a4aefca96d75b603277dd4046eab5c
font_02_sfnt_off0001a0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8E0 17016 bytes
SHA-256: e6e08455c976620413d287e85797fcd29c95131620017e6a92fda85523e2dfb2
font_04_sfnt_off0001d1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1F0 1924 bytes
SHA-256: b186cb3ef4e9f23bfd5ac91bd90e35bee80ede8fd0e210dca077e3a0d756e759