Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c4b0acf5e6b694…

MALICIOUS

PDF

93.9 KB Created: 2021-06-30 01:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0b8c9020f4b7ff51cc6bc218a69410a0 SHA-1: bb91dd0899fe68520e1f031ae86f966117e80096 SHA-256: 07c4b0acf5e6b694cd97e556014395b37cd21c92eff4c67cf26ffb652272efc9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://okulsanmalatya.com/imgup/file/nukonerewekonom.pdf In PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/iiou4hl8ludnnq24jcu8cek78c/sudobamuvekakapolare.pdfIn PDF document text
    • http://rc-modeller.se/images/file///88075198884.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be40bfbc848---81911097196.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc667fd02---xutifoxe.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80aa2eb572---95678545002.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/ninisaxizojufi.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/38110289992.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/bofevulodujox.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/sakotiremajafixonojepes.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3478cb91cb---gokimatofa.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16086844cbe244---97449047578.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/uad4c92lbfbi95du9fli9ol011/28577420373.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/14449274620.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607325241a5fc---renizig.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6f824b78e---giwonumazekipa.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/wubusolijokavav.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ce0523ecc---nefijinuzixerorumero.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/29591419014.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/zewexabudazoxuzaj.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc892b4477---54370374321.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ig3jviupuu1csc7par136rfq0o/xaposevuvavesarisi.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/15701501461.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f4778352---diginebexa.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb289406f46---83914359739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mission+impossible+4+english+subtitles+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 2952 bytes
SHA-256: 10d1b4f10ea5160e4e977b9e168c2e1d45b274b5479ded3d5ba336188bdde646
font_01_sfnt_off0000fceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEB 11136 bytes
SHA-256: 9fc8e806dbe99951c9787235be28ea34f2e24d81512d2852e6ac11a3ae6b4e2d
font_02_sfnt_off0001165c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165C 23120 bytes
SHA-256: cd08afd16128dab4894e98665406c30a0e7d722db69b1b4ff99231554cb04cb5
font_03_sfnt_off0001518a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1518A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1