Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2af91e0d52f8e4…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 07:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 203cff6d1d230d29330c7a1f4cfb071e SHA-1: 19a99e83d7ca305a926d30489f788b2c156b3bb6 SHA-256: eb2af91e0d52f8e414302dc8b4ce1a62c33c00d7cd48a9f5660120c7bcaddfab
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links and the nature of the hosting used are strong indicators of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/uplcv?utm_term=springboard+algebra+2+unit+1+answer+key+pdf PDF link annotation
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161399393091b2---51260378092.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/24894259580.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/69888677849.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/pixotolanewamu.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/57440592422.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/tubisinotor.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/lumavuvemuwasesusatojoja.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/bifawapefepuruwadebofel.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/32062419488.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/74798048173.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/dc037e272e2a86640a4b15161fd98f43/revedugomebajefebepev.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-13/20210913044717548841.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/fefurasumesogirojupusel.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/872347935.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/kolilejamet.pdfIn PDF document text
    • http://nanopena.cz/upload/file/vomofo.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/suvazuzabuga.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210904061316.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/luneniladiwozulo.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/434a5d5fd6363c0a89b405151332e23a/gatezokikimerodo.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_off0000d5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C1 18568 bytes
SHA-256: 281a189c33b5f081b25ae267abb921aed008e6bf10c4eb9d627b3af1840aba91
font_01_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 11452 bytes
SHA-256: a187cb7de2bf49dca7ee7be31f3d710ca2bc5511a586e884bf99b6e470e3e704