Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb056e7bc287430…

MALICIOUS

PDF

88.9 KB Created: 2021-08-22 01:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b51aa28889b4143c3a1cf9cf30d224b SHA-1: e59c38fc4cb3eec5391378e49d261e459644ab88 SHA-256: 4eb056e7bc2874306c29eb4a56feaa827bc2d24d7dc8be8c3f98508851b24d4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure and the presence of external links point towards an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baac8d8a3e7---xivexukejurexaleregoke.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4ff88f203cefeac34ba7a1e3f577b6d5/kaduj.pdfIn PDF document text
    • http://le383.com/uploads/files/vawurag.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021073016082023.pdfIn PDF document text
    • http://pasted-radio.de/web/files/datunefijipe.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/d5tk4ke8pfcjk602admo1hhutk/puketupevibovorise.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/8710712f2396f5ca81d0504a87042395/dalujabipetisalogow.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/80722140190.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076d2f17d694---rutedemexetutuwip.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/tuvetanopomotokineja.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f9a3ae488a33f582e6d6538b0b96e7b6/79688597607.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/4141418301.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/nebizeleb.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcadb7bdf5---6770365112.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/sedos.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/nijed.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609546cfc2a4c---sepironakulonemifez.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/49964479690.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094fb8a4c5bd---30130361611.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/fudalojepevuj.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df437cfc92---83559154275.pdfIn PDF document text
    • https://selltoob.in/ci/userfiles/files/rikorikiduzaz.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/11a1977a2e0620e9428a317f5234a5e6/xutotefupusupunenef.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210626074314_1923026562.pdfIn PDF document text
    • http://www.biblebro.net/wp-content/uploads/2013/12/Baptism-of-Fire-Good-or-Bad.mp3In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+does+good+baptism+of+fire+meanPDF 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_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 11032 bytes
SHA-256: f139548d9d432af5f85bba2ea219170edb75671824f110b0a81c6c19cca59716
font_01_sfnt_off00011111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11111 16804 bytes
SHA-256: 2955a21914bc3b17c95dbfb79aa373a5ff68361555593386b8615da228d51183
font_02_sfnt_off00013d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1