Malicious PDF — malware analysis report

Static analysis result for SHA-256 76aaa79a83ac70d3…

MALICIOUS

PDF

78.6 KB Created: 2021-09-09 14:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d42790c851a87a55188773cd4c829ac3 SHA-1: eb34b674dfa4bf70d0caf122cb35bf6dae9a30b4 SHA-256: 76aaa79a83ac70d3f4edb5ef800db82bc610f6e9a7ed5596594e587258abf9f7
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL analysis indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://maychieuvinh.vn/upload/files/fidegamejepujanezajud.pdf In PDF document text
    • http://srmtteaparty.com/uploads/files/202109072250075685.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/23605928653.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/99446614266.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109020118073190.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/67237831358.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/80818680835.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/6548157631.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318368cd00d---93176348103.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/64642115499.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161303315a533c---fazedijazuwitaref.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/23916248999.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/50697963842.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/ledemuzib.pdfIn PDF document text
    • http://cochemical.com/upload/files/rajemixukonibizezebu.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/20605538486.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/97625001485.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/nuwijukosifalenorikona.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/79aab0c2dac311f471b828454fc1dd19/16112668997.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/todizi.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/kikenekukasonilutax.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/42969754963.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/totimidezejuzupokemu.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/33646582044.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394668325dd---29195983067.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/visapil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=when+we+were+young+chords+lyricsPDF 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_off0000ccf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF7 10680 bytes
SHA-256: 7fbce2a6b0e53c75bf4138783f06e8f10ab478ddfcedb7b78e6bec41453c7c1e
font_01_sfnt_off0000e52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 18352 bytes
SHA-256: 2b89211d81e670599102c0e4265558953c30d93976e718cb9ab9f59331bb8c3f
font_02_sfnt_off000114ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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