Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c510815b83a19f4…

MALICIOUS

PDF

78.4 KB Created: 2021-09-11 16:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b4518db338adba2acd2b45b2483d418e SHA-1: fdd3cc6bd82ccf4a6dc545c7126e683476a9198c SHA-256: 4c510815b83a19f4b810d4f6fafbd8b6f695c84c0a9ee4bd0963231e254073f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=can+i+download+play+store+on+pc PDF link annotation
    • http://studiomalpocher.it/userfiles/files/kovukijanex.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/aj97e20s1kad2ahf2pos7me3na/davob.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/88059667695.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/89716408468.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/f85a082bd2bfa0b3e7fe304c43c33001/darifonekoju.pdfIn PDF document text
    • http://espicycooking.com/files/file///sagogevipuzasoxitesawajol.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/zikizofiduxamurovudesivux.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/68935005810.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59454ab867d5a12360e887c26fcb28a0/xedubabaraxonop.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/gufosi.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0b0360b30ed09f1bf8b6dbf2709db050/3051023476.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/895j2a3jtduf55jnft39c0gab5/webodevuzavepetujifalibog.pdfIn PDF document text
    • https://yasacompany.com/upload/files/kinadufaxevotomiditowo.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613945101049c---xogelanaravazuvapib.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/wizepubodapi.pdfIn PDF document text
    • https://masukpt1.com/contents/files/69023023804.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2ad9668cb---lejepidefupivajoxaga.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/vemalopi.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/subawe.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/18281820123.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/20770312172.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/60325122234.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7ddeb4a624fae0ff2485ebd481f75ca3/28240622149.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/62489861371.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/fonosifuwitosuveze.pdfIn PDF document text
    • 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_off0000d075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD075 16412 bytes
SHA-256: 4befbc156aa44a424488ee417e05dc8881e42d94336b1acb6dba6e82ca0ca64d
font_01_sfnt_off0000fa81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 10736 bytes
SHA-256: c693eb6c4d81603458029a43c1a1e5a4b75517b7fef070608d20de9c07bfa16b
font_02_sfnt_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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