Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da3b6686488028c…

MALICIOUS

PDF

84.4 KB Created: 2021-08-26 08:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ddd6a9cb3d43957b30981281ad384d1 SHA-1: 454aff75634a62d244cad8b9ad99c20845f881c1 SHA-256: 1da3b6686488028c14837bba64e2276aa5c5b2d23336279b22f8cf82015b70e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://oniceh.ru/uplcv?utm_term=meteor+coming+to+earth+2020 PDF link annotation
    • http://dieta-plus.pl/userfiles/file/dozabuvozotumud.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d71e4b015f---32382524927.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/38187849277.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/41317682017.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/dasupitixijezubonifawadax.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/62636468781.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b49ac4d6fe391d11f18876053964276f/93959261624.pdfIn PDF document text
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/76491150534.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/tuxatekasim.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/1404534526.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/25631266468.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dfe0ae7b2---digafame.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/finevunurodetuzikuzuxelax.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/11047f1dda4760010b3b9778d87a7826/87310743174.pdfIn PDF document text
    • http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/63113194233.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e423ebb27---xoromofawajatuninibiwog.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/49f030c3481485c2fdd29adb1511169e/60784875234.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d53e478d865---55508658047.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/45165860742.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/motatipesaveg.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/jagomudago.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/jof25fbj6kt3vqaaunpfti4m5q/dobewimabi.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/72573317811.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8cbdf1fec801acee360eb7e1df871064/70425946549.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_off0000e4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 10700 bytes
SHA-256: 69d7a1577978f8ac31a9028ebeb2ca72df498d8f54bcc5d65cdd1b3f13795b93
font_01_sfnt_off0000fd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 17244 bytes
SHA-256: ee8427c8570f1815d08dc9bffd6f203b5f76325f1b53ad1e6f08acba2d679b71
font_02_sfnt_off00012a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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