Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce24986b5ceafda…

MALICIOUS

PDF

104.5 KB Created: 2021-06-26 09:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6ab6539a21a70d26bfdf5f5754121272 SHA-1: bb188cfaf0b05c568110ee4f7efb354d24384883 SHA-256: 8ce24986b5ceafda7bfa4933f20a018b2b27c005582ee26e1bbe3ac2eae932ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely serve as a distribution point for further malicious content, such as phishing pages or malware payloads. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or track campaign effectiveness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • 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.
  • 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://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/bd9ddafbec28177dfdbe21352b6b74ea/27907253291.pdf In PDF document text
    • http://unipsyclinic.com/userfiles/file/20210619200220.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/314c1f2a117300ecb6571105d79db55a/gemuxetipuvo.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/tuzuvokimesuzalevi.pdfIn PDF document text
    • https://educhina.mn/editor/files/93615409872.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210523/file/basojokidujubo.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/bimuzutolijuvopel.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b7a10c40d31237a0d60c6e3ab533c170/bapoxuzigizon.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892988908fc---xawerix.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8bb2e51b---82598803763.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/mpm6ra00a968ltja98m67qvob6/kerafuk.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/putatopumuzexonatipof.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202157229111275.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c285e98e9f7---30935170774.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/nisilopijebakumeg.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/a35b17ed43b35a8de49d7902661cda74/97098398938.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af7884f145b---89894484337.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bb643e9ea5e---gozemorevabuka.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/76539135968.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/duralenuxivaxoresedupexek.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/2jluh0t5rdk961g1vpnjp1d4uc/86554394451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=question+and+answer+of+force+and+laws+of+motionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12112 17120 bytes
SHA-256: fd22384663a743e620a36576b8d1a2187b847ad750ee240e868871c6d3f5a4de
font_01_sfnt_off00014d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D58 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off0001628d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1628D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AA4 10884 bytes
SHA-256: 66f2166b70fd0c2bbe5ab6b381256fd90970a79c71058a56bca5e79fefe8a791

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