Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e6c2fc6b8c4a45…

MALICIOUS

PDF

84.5 KB Created: 2021-09-10 02:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1c0dde7e2c6b98b6f90eeefd88b1dfa SHA-1: 91107194334656527c731d940224593d0ec1cd5f SHA-256: f8e6c2fc6b8c4a45e6e14307971139162311ef32a0eb66e77c95933592799fa2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggests a link farm designed to distribute further payloads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://krisoc.ru/uplcv?utm_term=mantenimiento+de+pc+pdf PDF link annotation
    • http://www.anjhimayath.com/upload/file/donefagifosukiviton.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/74154900670.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613650aece78d---2439950713.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/dezonu.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613658d8494a4---pawuxa.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/nofolilekojatagetosapaku.pdfIn PDF document text
    • https://viceda.com/userfiles/file/karovuvos.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/nopozitijonisope.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210904210134.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/winizutidetumove.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/34246353969.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/57582148569.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/womozabelomipos.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/38565771643.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/wewik.pdfIn PDF document text
    • https://braus.uz/images/shared/file/kefivaxiruvefodarojo.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/tegenolevudeti.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210906182746.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/judanabekonopilugezal.pdfIn PDF document text
    • https://phunhai.net/upload/files/66252103239.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/tediromadutinowifu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a3f8c1b8e14c05c31bff08972d23f9c6/wefokudiwugidebadula.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/gesapafebefixu.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_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 18012 bytes
SHA-256: 8c6ab7bcd8ad49d94a65ca9be66a508d69613d150b09f187176038f512e06f18
font_02_sfnt_off00012d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D00 10460 bytes
SHA-256: c42607f3881ccb1e6f8a1423a7b5052c980181e269e9dbca3af309cad1c5d7bb

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