Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a64e78ee6e76a6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 11:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5ce2dbb8c9d638a2e3786cc801ffb333 SHA-1: 81ef18e67f693723749211b7acc81b9eb00e8384 SHA-256: 58a64e78ee6e76a613fa75e87eecc16ad313af10d4def766567fe8130f3b8034
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised WordPress installations, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://btsoft.vn/uploads/files/92026074390.pdf In PDF document text
    • https://posetili.ru/userfiles/file/jukerojaputolijaderoxiwa.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/nomapilagexuba.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/74166505113.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/tonerigilodu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613029a8ae45f---mokezuzokamol.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/pebobop.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/64893445724.pdfIn PDF document text
    • http://nanopena.cz/upload/file/93833375155.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/jatotabularo.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/lubururowu.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6de7739de---ronisigepodaxonepixumatu.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///weronatub.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/34894596690.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/16484172563.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/36051766657.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a185f9dd19---94285422191.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/85306418220.pdfIn PDF document text
    • https://geniodelweb.com/file/popoloronolufebetowok.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/zonufuje.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/wosizikipunuj.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/5625378027.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/64147964891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+art+of+jedi+fallen+order+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC1 17688 bytes
SHA-256: dfe660c142e89d803571797e84b6f8cbaf3ae4993ad8074a0b0012f278ebe07e
font_01_sfnt_off00010cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CC 10520 bytes
SHA-256: 7320d349b1e67dfa6c87a369537eea62a10fa0e253ddf816ed504b76b7421240