Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55f4f39fa0a4113…

MALICIOUS

PDF

88.5 KB Created: 2021-09-01 14:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 846fcc765a40565ed28cd6d13b3115e4 SHA-1: b4c9c9de35c375c84ebed1980f5a4cfcb812b120 SHA-256: e55f4f39fa0a4113aa49458484b66cdb9ec14d7b8e1203dca4b71e8aeb2ed21f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. While no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or malware delivery attempt, possibly initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a248b6cd4452ebd0f22cf51a08a1eac2/23319232017.pdf In PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/napizaduk.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/temewuzegolemesorisiz.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a27f201006---xolubusunujas.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/dedufitokelozi.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c122e4d0f87---29405426912.pdfIn PDF document text
    • https://liffeyartefacts.com/fckimagefile/file/jeposetaxanezitefofuba.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/48405373954.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/pebabonif.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/76192430461.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e62bd6d7957b71e4d13aaf1e31dae87c/95634304920.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12c7d281de---32925646152.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad889d539---26708646694.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf50ab90686---42221056080.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/43399871111.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/45616612062.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/gedusero.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/mogasizi.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/8f89520d1956f67b032b68b6d0c7e913/92617532403.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/37020807412.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/zopajirusukifoxipabugedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=metaphor+for+heart+beating+fastPDF 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_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 18232 bytes
SHA-256: a7ad92f03c6e8ed59c5e23f15c5e1a32ac4b89ca7e56c6e7f3ba984e12953e72
font_01_sfnt_off000122fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B13 10724 bytes
SHA-256: 2e9cc1355dc36ad38c2c453d3ab26528fe03de733efe2ee8e3cdd0aaee2acee7

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