Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea2456e27bdb6c04…

MALICIOUS

PDF

78.4 KB Created: 2021-09-15 03:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b36d4f7635215acc2d13a3935d1d4e28 SHA-1: 10ef6f06c3146b3d5f3c655627bf2d28dbce7d10 SHA-256: ea2456e27bdb6c0497a504e572cc4f59e3a995124ad4881bc521c51dd4e4e5db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of these links and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://pistant.ru/uplcv?utm_term=smackdown+game+apk+download PDF link annotation
    • https://polenhosting.com/calisma2/files/uploads/jamamadofabeno.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161411b76e7b46---kebitiwoxaz.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109060408192927.pdfIn PDF document text
    • http://sjhtractor.com/d/files/37686520301.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/zabokevegazedi.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/bpvrc4ol7hu5ct0hl2ce8im20u/8897040394.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/gotuzelogapagozowatawigod.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/ruwunemawevaralavitin.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135836a33dad---2999567128.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/gufiwisuxinixepujes.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/54002449744.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/sofixobisoseli.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/35360709084.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe9fd1f14---49791517679.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/57289386112.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/koveruzetububexagaze.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/midiworaki.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/dmd2qp8f4kksj6k3a66pct0gmf/kusududoranetipirewam.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/59195306403.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/99322020721.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/linobanimorine.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/29015347896.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/81704606564.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_off0000cccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCF 10652 bytes
SHA-256: 92a0814f89387fa3c0f609a195047b9a7f5e1198a5585f52187e26a9300e27c0
font_01_sfnt_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 18236 bytes
SHA-256: 177dadc3b841215544bd8d38186d732a01a3904127246d633bfa53aa44978440
font_02_sfnt_off0001142f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1