Malicious PDF — malware analysis report

Static analysis result for SHA-256 895c818611af5de1…

MALICIOUS

PDF

74.6 KB Created: 2021-09-16 00:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4005762fcc1ea7ec754532fc210eae7e SHA-1: 2b39b71af6d8c7c20edecc601b4ee6bf12100d1a SHA-256: 895c818611af5de1251644e283c4f09e7257cbb1622594962f00884ce284b52e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. It also features a link farm pointing to multiple compromised or disposable hosting domains, suggesting an attempt to obscure the ultimate destination or evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://uro-medical.pl/zdjecia/fotki/file/fafugisunavigogawenivomog.pdf In PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce1ab98038---sivepikukutogarenotax.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/pixevobefivajifuwe.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/72787485766.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/64311004810.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/52727947295.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/52301872997.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/934156172.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/14493702644.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210907031837.pdfIn PDF document text
    • http://dkind.net/userData/board/file/japojixofolawiruwufamap.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/97008500508.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142195ab0b23---vaxudopimaxek.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/08e153b56ca89ab22f6e1a818b35999e/lazuterowekibajigixa.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/zujajul.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16141701dcff6c---97168249482.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/pivugogabinemajobeg.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9fcb437f---4933359187.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161425ece95f3c---zodigulokepewamakivu.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/31766447443.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/wasejifop.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/fibatakowexaxekimavibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=sullivan+algebra+and+trigonometry+9th+edition+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_off0000bf29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF29 16592 bytes
SHA-256: 330964197b134883a6b056ba52fa91497f6c044ec80778933fc7e487f4696249
font_01_sfnt_off0000ea4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 11440 bytes
SHA-256: 85abd51047dae78faf7953d6ad14d72108b62b38ce117541d6eff75aa5f9e6e3
font_02_sfnt_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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