Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67e829ba9ab7f45…

MALICIOUS

PDF

88.0 KB Created: 2021-06-25 20:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0492e29e390931841588926f9e6b1016 SHA-1: 97528a231f7ec2e01e2aa53672bd285fb86a5816 SHA-256: c67e829ba9ab7f45116b821f9866d1fdb13f0dd5c392a3f0143862892a2c591c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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=dc+super+best+friends+forever PDF link annotation
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083258eaa4a6---wusiwadika.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16076dec3baafc---sulig.pdfIn PDF document text
    • http://freeski.hu/freeski/file/visekufenikeloruwa.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/xeboz.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/6be420cae9e66010bd6946227bf04242/58725906857.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/915daf739dc34b3d808cac899f5e9d37/25764148076.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c33f86f47781f865ed6cdaa4566c5d07/kupow.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc50940fc9---savuvepovonokoki.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/gukutusor.pdfIn PDF document text
    • http://vce34.ru/attachments/file/34012242360.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5dde5cd39---vatusususufigalekerusesu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d993f11fce---89217531264.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/80250895080.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/jutapojimarajofibagaruf.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/74c3f186c9ed5c09d46b7e1629420ae0/xudikexu.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/mozanefef.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/wifabuwusadabudasa.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/vesogejesimiwaloxukiwuli.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/19150345903.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-13/20210513202659128797.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/84fhh8qm1kne485dopk3bisnr1/xobivesowikubarixa.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/gefirajemi.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F6 17260 bytes
SHA-256: a3990343ac6e31cb8de5aad4032da01797412d786fac899c25d087f406c5ac07
font_01_sfnt_off0001228c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228C 10712 bytes
SHA-256: f2e364b185b1a36eace12763c932af482b7162a375bbc0aa11f6c8d0a708a68d
font_02_sfnt_off00013b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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