Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52b604767644262…

MALICIOUS

PDF

85.0 KB Created: 2021-07-03 02:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e952fd6db7faaf98e77163d8324c1987 SHA-1: c67033cc3b82805070495880c4c6a6e4bbfdce2b SHA-256: d52b604767644262266a6c9576b5d794508b332e65a2f90eb842d5e0cfbbbd0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=fluoxetine+is+for PDF link annotation
    • http://china-hold.com/UploadFile/file/20210611010806123.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/livadusesorifirenoj.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16097cc9588f8c---mizudumivunabaxagejidopo.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/lokodegegomidex.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/mgj87sqbigii8kt4u77t3ckht7/43394616983.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6a91241d4---66171004731.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/67927696099.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/63978906679.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16085043e603e9---134554062.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/69898823661.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/1ef1ed84423b81af655faab7eb08d34b/pirusexikuvuxudawofo.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/78677417024.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f043b23bb---dujegibagepinuzowovusid.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/27975836299.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/8558060331.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/82091504719.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/uvqhdtpbcn8plv41tao9d8mmb3/tojemenogome.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/pejavitibazozimid.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/96817545403.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ead02fb8f---petekipuwowatugaxibuzuda.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jt8rjesrmmg3pjtbn53l1l09ah/4200389621.pdfIn PDF document text
    • https://longhoang.vn/upload/files/6207457205.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_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 10224 bytes
SHA-256: ffdcb24b3693b3bbe0279e04b666d53594807f7f07a3ffaddb5e72c99d6c8f43
font_01_sfnt_off00010388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9A 16884 bytes
SHA-256: 809fca8c55daeb9314dae9439dac2b10129045b43d83295e9a522074b364544c

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