Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c76112e1b315447…

MALICIOUS

PDF

127.1 KB Created: 2021-06-29 07:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 78cbf082e706f127f36572aa17b5c2d0 SHA-1: 2a62d3e87d9618dbd9800d4dcec7e10a626722d4 SHA-256: 9c76112e1b315447fae6ec91a80a0ce8d6c79bff8c5c0d13c27c5ad0d1b494b0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://temple.mo/userfiles/file/25341398627.pdf In PDF document text
    • http://meyanko.com/userfiles/file///tugowedi.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075e6fd329e1---31983985612.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160989ea7d9ed2---piluxixobibomosapaxud.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/67549339306.pdfIn PDF document text
    • https://castel.ro/userfiles/file/24145804377.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210609_76B73C5C2E5AB5FD.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/mametibesadevisinibovekij.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/jf1ar23179rfj8p535dog60sr6/sabomuboxetabufemikepijif.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/javuvuv.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa766497344---jivosetesodowojivewa.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/18150643301.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc46ac7f97---luveda.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b323a8b52---selodoxuxemowubabej.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d4b12e9a8a174f56077a3216226edb88/63910889523.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9de12465a---zimabo.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/blndnn8c8cncvdll7pjg4i9oua/ropavu.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/54340258452.pdfIn PDF document text
    • https://khanikango.in/file/sudapavaremuwal.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/9586481971.pdfIn PDF document text
    • https://blokhol.com/upload/files/veletuwigi.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///kexiverav.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/kozizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=protease+in+laundry+detergentPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4C8 18960 bytes
SHA-256: f57946b43ea4b0c0c35637ae2f481f14878600c881bbf548f6f49b112f720d0b
font_02_sfnt_off0001d685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D685 10640 bytes
SHA-256: 8a918f4da7f10d71c940a8bfb2373cbb89f6cef3df6dd6005c1e507ca047a68f

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