Malicious PDF — malware analysis report

Static analysis result for SHA-256 1544dc13bfb40493…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 10:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6f5c3d5749ab073dde994b1f01d39eb SHA-1: aa503234874066255ce283fca891f5146ef07527 SHA-256: 1544dc13bfb40493468c3067102457561c1978ba52ff8e0ad8368aa0d6c7d80f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of multiple links pointing to various domains, some of which appear to be compromised CMS uploads or disposable hosting, suggests a link farm designed to obscure the ultimate destination and potentially distribute further payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://magendans.com/imagefiles/file/denafiku.pdf In PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/7592858362.pdfIn PDF document text
    • https://granitnet.hu/editor_up/naxudulatunomup.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef94aed60a---32956067512.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d4aec79972---79417284923.pdfIn PDF document text
    • http://www.juthamasclinic.com/upload/finder/files/xabiwosixafabaxekojeno.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021918550455855.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc2305eb81---81488550646.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/83012605812.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/gunasomedukibivefup.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zenaxokatuxifekisula.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/20968998643.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/jetavexivola.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/4560714939.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///63080197362.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/25970489895.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/xuvudimune.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/68736006615.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/wofuz.pdfIn PDF document text
    • https://labelmarket.pl/data/file/joxidesuderitisujewagig.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/38696536279.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/nufabepumazi.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/zodiwomupuwogete.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/paronawizifawuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=csr2+mod+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_off0000b187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB187 10284 bytes
SHA-256: 774015496dcd9a1af6e034833d89b4654d3bae396a6887bb5c51b0b588e76a0d
font_01_sfnt_off0000c8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A4 14736 bytes
SHA-256: b394f50c9a6f6b84a34886cf9ea0e6939fdb8d0b5f0ef13eaa1291a6d445f9de
font_02_sfnt_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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