Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab97c6a41b57d6ea…

MALICIOUS

PDF

83.2 KB Created: 2021-08-18 23:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ac745ae50ff5031749baab3c0ea1a705 SHA-1: 169ba7a5f3e0493287a2b0781038971647a40b11 SHA-256: ab97c6a41b57d6ea89d2a2c31e406918438d7e1748e55f8df60626dd2bb1eac5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised hosting or disposable domains, suggesting an attempt to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://camelliafb.com/uploads/files/202108182226283268.pdf In PDF document text
    • http://arci-mp.fr/admin/File/kiwopofege.pdfIn PDF document text
    • https://foreningenflex.se/anvandarbilder/173/files/52107459709.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/50343553252.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/30732283555.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a83737b7be3---vorosop.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160825695cb6c4---92354035861.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/41ec6d307193e8522af65975c2aceb0c/24582545160.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/10854524740.pdfIn PDF document text
    • http://runo34.ru/attachments/file/56446013526.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/35497154711.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/b36d687ee160f63def13bb81e4df7abd/50902781544.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/kagazapabevojizezebateb.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4df75096e3---rusasumutalesew.pdfIn PDF document text
    • http://sns.hu/_user/file/95394900459.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724c9d346a8---didazug.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6aef21081---bijumukaja.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721e691cc10---fovujidot.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acf8dbcaf6e---lodizodazegezenatal.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/29081631332.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/jediduraladixud.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/74693340689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=engineering+drawing+mcq+pdf+for+alphabetical+orderPDF 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_off0000e225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 16444 bytes
SHA-256: 7473fffccd1aca12724c050684ba2df10739382bfbf349be90467cd6025581b6
font_02_sfnt_off000124f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F3 11252 bytes
SHA-256: b6ced2df3e8b700843371cfd640fa6f1a584d6dd63b7163ef99dbf2b9eb3080b