Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a252a437e6f0c2a…

MALICIOUS

PDF

88.7 KB Created: 2021-06-30 16:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ecbcdb7b34f514c0dc7467d84d7dcc65 SHA-1: 9a47027c10ad63d32b2e4f7c1fc521e6434d7596 SHA-256: 9a252a437e6f0c2a2ed39806f722c16bc5f64b697601a2e938428f2d9cca6a6f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a phishing or credential harvesting operation. The presence of embedded URLs and the heuristic for a 'QR-code redirect lure' further support the attack pattern of directing users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://philabc.ru/uplcv?utm_term=one+page+cv+latex PDF link annotation
    • https://pametnidom.hr/pametne_kuce/userfiles/file/17800755424.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021062010013673499.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa984e6531---rapobogek.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/2b7fbd505a399bd2dbef54050c85b2bb/88942612366.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160897d478fdea---xolofuw.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091d3356f664---kesado.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/difenadubu.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ba3c1e43bb450405b9b9a543dc94cd22/17265191323.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0e26c6751---67851682825.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/93906556080.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/livuloviputomurusa.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/14972275016.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/112bbeeaa6e5ec317c86227a103f6a12/90409088357.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b0736a38cfdac0b30d21db094461428b/sisunobowadejusaxavejig.pdfIn PDF document text
    • https://attack.lt/images/files/sotetipofuriwidetolarefom.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a995f6887a8---99096069940.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/samawewabed.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/0633b96c5cacd44a0a2bf9c93d6c14b8/katikobopomip.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/75470499162.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/vudugewexaviviruzazejaf.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a00c9d6031---baxatalesaxojarax.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 10260 bytes
SHA-256: b7b3f636c3c419823735b0c8f9a80fbd526701fdfcde143185ce350aaf2b3fc8
font_01_sfnt_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AE 18152 bytes
SHA-256: b6ce1d2848d80c179fe8eb43b9bd72dbcdc5942de132741baa725fe363203c4a
font_03_sfnt_off00014677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14677 3472 bytes
SHA-256: af51fb30bc9d07ec39d47ee4a02bc6d9b3b5e2ef77e02455a016ab3f572a7e7b

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