Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3f03900c356e5e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 10:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba6c7c1241739471b3986ae02b2d33ef SHA-1: 98449693b4c779cc4f54167efff315604f891883 SHA-256: 8b3f03900c356e5ed864a4a5b6c508b01e1f396048507ba81f4e23419d9793a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.adarshvidhyasankul.org/userfilesfile/12584719760.pdf In PDF document text
    • http://dalaichau.com/files/11347529810.pdfIn PDF document text
    • http://axwelindia.com/uploads/reruwomuxenebelagurunid.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/79194051576.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/wanabere.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/fegupodivoboxuzigeliwewu.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/cb3dc84322383320d397635e5060e09e/nowusunasefanolotapegaj.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/wajudat.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/85481623693.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/fevubirumul.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/99661238360.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/usr0jdr8pgcel24s2c2slfv647/zimiwizisonupiwo.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/5e66930c11329ce8da732a2ffef1e382/rigutenifarirojeferunigu.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/wuxideziviwi.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/zaxifovoked.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///zutebuwatofepipo.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/8135150949.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c226ca80f62---42096692890.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/r9fp6q3f96t4c2n91ukv7gait2/loruwezoru.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/mibejasizugibefabuvoliz.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/k3ndljanv4k3moa2h659dih8v0/fapufuvagat.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/51930773373.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/zomexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=naissance+et+expansion+de+l%27islam+pdfPDF 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_off0000dfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 10796 bytes
SHA-256: 02b3b376c236af4fa56d42554149512d6812b50ba3a7f6bebedc510fd5020d51
font_02_sfnt_off000110c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C3 20228 bytes
SHA-256: 67676a2b98fe7d2bfaef76784f50dcf731472d1ecdc3725fe5b144cfd650fe44

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