Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce101fb7efd7aaa…

MALICIOUS

PDF

76.0 KB Created: 2021-09-26 20:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2aa16ddd80a26f9a34717c2c58d93685 SHA-1: e6e293d5fb687e45edf68dd7fa8b227a5ca3cbf2 SHA-256: 8ce101fb7efd7aaaee0c7be3daa380694e8606fd7ffa6db19f58f90eb721a73a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to link farms on disposable or potentially compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://sambelteri.com/contents/files/58716167605.pdf In PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/lobelobokixe.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/69595818856.pdfIn PDF document text
    • https://revive.fashion/upload/files/jotagitesemep.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/xufejomolowowexatagonimux.pdfIn PDF document text
    • https://bdata.vn/upload/files/52676696881.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/95421537563.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/maresofut.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/29260893061.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/popoxeku.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/77312746713.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/xonazusamaju.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/fubejolemipi.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/80635844785.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/lilepara.pdfIn PDF document text
    • https://kueapem.com/contents/files/14638336908.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/fevilexetexalugexajuzatu.pdfIn PDF document text
    • http://sinoorchids.com/image/file/50740763451.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/74807749146.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/75254337956.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16138c2c9af3cd---44264066297.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/tevogemufen.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bdb95882d---mizabimemotipu.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141888864f73---98677449514.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/74279181044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=broken+age+androidPDF 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_off0000bed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED0 20292 bytes
SHA-256: 0ce370b98dcba4ef9ae945dcb0b0c5704a24368ab5b7255c766d26240a5f7329
font_01_sfnt_off0000f3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 10256 bytes
SHA-256: 070c361323fd11b26a6ad0aede68bcecd484b3dddaade9b59e8851db11cc1a17
font_02_sfnt_off00010aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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