Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a9a11d4cc96150…

MALICIOUS

PDF

73.9 KB Created: 2021-09-01 18:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b0e4fdebd9b76d5a14a657a0db073c2 SHA-1: 80ec55f9f6e8dddace67e6ee6e3d968094c1de00 SHA-256: 51a9a11d4cc961505a619660c93b9aa9e7293912d94ed46bcf4ffa5915cdc91f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The PDF also features a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to obscure the true destination or host malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vieclamxaydung24h.com/upload/files/99247433788.pdf In PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/5e24d30f472847fba5e1d8b92f4ad20d/tegawugugowodewiro.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/gezabisimo.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210505231058497554gma0z4.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3ornrtmrajp2gg7rbg9u17b9hs/21534699765.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d12af8772c---88189422706.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/68489022588.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16124c88289789---72680367211.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbe976cddd---vadizex.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/81ce72a04386334c01a22af2482adb07/150734753.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087107468988---44261179786.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/suvamolugunawu.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c37d57577---53175603057.pdfIn PDF document text
    • https://menu2uplus.com/images/file/75437488256.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608392819288e---37660324635.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e97d1e0fe7b605a302a214c3bf7f5104/zodab.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724479e5451---58149136355.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/363962bf5cb61b5933edbfafe22069f8/69491828799.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eadb85975d---10056317164.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/semijude.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1b6up0v1a0jto0mh2s3v0jb5vs/21125045791.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7hqi6j92h1hq068trl9u5bpff2/50125380801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=we+are+ourselvesPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/mozabaw.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_off0000be5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5A 17660 bytes
SHA-256: 6ff69c89ac62837f03d46aa8794e3ad3b4d08aba3814880ccd7428ae4278dfd9
font_01_sfnt_off0000eb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 9964 bytes
SHA-256: 4f5cf05dac288ff461f060a6917260ce35778a949fb50497a9791139148247dc
font_02_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.