Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b8df549c0a258f…

MALICIOUS

PDF

84.9 KB Created: 2021-08-23 18:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7a9a0ddcd49c4ce85f72eef1efbd1761 SHA-1: 4e7330929da70197ff9ba908ea8b87b7aa57af4e SHA-256: 48b8df549c0a258f7c2b1c34b849da6bb8c4466e8ccad75a48965f24e138f757
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on what appear to be compromised or disposable domains, indicating a link farm designed to direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://linkevicius.com/upload/galery/file/88699801819.pdf In PDF document text
    • https://activepymes.com/pub/file/36436194984.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/28f58c3d1e0df01bc36ee74b5086c06e/54068895922.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/08/files/210801185103.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/915138595.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946d0c33dc6---vodaremowowagijezoriralom.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160beb53db3bed---19904305564.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/49186790243.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a0f3ab429861f2ea5b7ad8aad274cf3a/legune.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/93676665046.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/90854745230.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/22b3ac419158453223737410209d701d/migawibakuxijexugop.pdfIn PDF document text
    • https://digiconelectronics.com/media/45035769551.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caebc6664b---77040009110.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/kevegisefir.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/vin23vfliv7b46s339eemrcqn2/57348690026.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/138703c2927f67e4bc4e2c2dd464b85a/banupima.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/sevewotakixazike.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/puviloluzevodojibiz.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/zuvoduruzem.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/pvm3nhh6td1l2pvb3o658nhne7/97448058378.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/44d86650308badfba08df1ad4a326d5b/xamupijip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+two+seater+convertiblePDF 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_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 10568 bytes
SHA-256: 4bdf995f7aac101562057ad3fd229c4747f80e1a47248982c397c6a49dadb540
font_02_sfnt_off00011c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C00 16036 bytes
SHA-256: 7d729974357a87db8472459fef5ad362c4079b1c95ebc8eb27c2c44c2a9e39f9

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