Malicious PDF — malware analysis report

Static analysis result for SHA-256 1904b4dba036338a…

MALICIOUS

PDF

91.2 KB Created: 2021-06-14 08:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9909c59a59d8af6c7acc405aaf578714 SHA-1: 4eab62a80da0b0a7903216810af338a0f1ab3149 SHA-256: 1904b4dba036338a7462827987a70ded090fcfd41745832aa7a9cb0f344541c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://chcial.ru/uplcv?utm_term=mujhse+dosti+karoge+movie+mp3 PDF link annotation
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/6bbb42270a62c9db4d854a33e4a9519e/gusedeja.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099100bb457e---68331204390.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/3bcd72d746d16b405fd096319fadfee3/19107684645.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855aeb0e65d---fimevezo.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/fixapafevavoteraxer.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af3a022cbd---73141058935.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/u1tjgcbn91dvkl3ec8pooln2a8/bipomumimopipabumiseto.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd57d2b030d---dilovejuwowuniwapoxedalo.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a29399846d2---silobuxiranenanuvifog.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/53568873849.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b845d19b4---bukewafojamadulawajareza.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf26c7c659---90826209600.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/ff357ae89c9eb59821de1d54fab52db2/nuzutixulorabeviwo.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210528_A9FC0310F3B705B2.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/5a837c81d81c55a2b8f40e98e20fffc9/sebogelawewunuze.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fac3192af---31851106808.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/fovoruwen.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/68572059968.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcbbee5d70---20646479337.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012bc7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12BC7 20332 bytes
SHA-256: f914ed4a388b5c2a484c0e7986b9892e8cc6f961857cb2e4414fa66be0170607
font_00_sfnt_off0000e864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 5712 bytes
SHA-256: 6f38bef5184f303ede6a4bfcfd23e53b6a8570621a29f151bd0a42ba73d65173
font_01_sfnt_off0000fbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBE 3140 bytes
SHA-256: 6994461771cc96888825acc8a8f1a2d160bed99c77e1ed0ad2d60dd288e20d92
font_02_sfnt_off000107a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A8 10596 bytes
SHA-256: 7a6da4bcfe1897234b49f8aead5f75e96b62fdd9f33e47b7c8d16c8b26333dfb
font_04_sfnt_off00014e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E20 4336 bytes
SHA-256: fa67741c3b27554481d438afcdc1bb82220ff92b753bdfc51925396a58169ccb

Open this report in the interactive analyzer, or submit your own file for analysis.