Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ed654690277793…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 21:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eb4c8ac1ac121a696087e86457d26d1d SHA-1: c2afc7fe346323996719f03159f21f3509e3b435 SHA-256: c3ed6546902777931fbb1eee5eff14324dd6c2f61ef1829fbac37cd0bddcfd83
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm pointing to numerous domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vattuxaydunghl.com/userfiles/file/zubowabimomapaliwas.pdf In PDF document text
    • http://telegid.tv/userfiles/files/foxogibabeges.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/17264833901.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/dbcf8jkv4qshdpanrjsthot4s6/12228488128.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/30938136577.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/karaxewutuvakovupadudas.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/25ab2f21afa5042862d87ea18b5e867a/judovijoxukivufujokuw.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161204f1172a96---runusazamekoxom.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/42db5ea2fb93837a2b5585a4a82b6567/fuzilelarowozat.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/cdca680699ba1852fcf500057e453b59/22980885328.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/bifepopatojaji.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/34140689101.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/57c6fddac5ccc5d7e13360299970ca08/zigifadatukajogiwapuz.pdfIn PDF document text
    • http://terminsk.by/pics/files/34773134210.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/naxujolefoka.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/17228526650.pdfIn PDF document text
    • https://questyme.com/userfiles/file/73991526438.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/tixurusexedefajuriweme.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/83398622561.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/74385524570.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/53720695743.pdfIn PDF document text
    • http://prmakeup.com/Image/files/warivewavemod.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/36931220178.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/161296f0402b5d---9467403837.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b298246a41c---64026525701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=blue+space+wallpaperPDF 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_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 10192 bytes
SHA-256: 18c854cb3c8e9b07b380e22625f4e9c5b4ffc19717c00050bc16b75959ccf167
font_02_sfnt_off0001077f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 17832 bytes
SHA-256: d0a3cf560b88c4422976feaafb0f922b6fb16de8a4f5d261d6f16f95b4b13a79

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