Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b54984e6b5ce4b…

MALICIOUS

PDF

102.9 KB Created: 2021-06-25 23:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eba672b53042df16a5e7f1f48ff44939 SHA-1: 832a90ca82ee4a8580222d0aa0d5c3a6db4a8c84 SHA-256: 89b54984e6b5ce4b19c43444976314a9dbab0478b1c8e393e171fc0efd776406
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple distinct hosts, many of which are hosted on compromised WordPress upload directories. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160750a28f2f58---33536540353.pdf In PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0307d5f51e---tezerusogitusuzosigada.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/9dcbbh66v6q8ka2lt5cqss55h2/bivikofi.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2f34eafd3---11993544935.pdfIn PDF document text
    • http://ekotronic.eu/files/file/2245213541.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c781f1510a---sigopoluta.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ca587780312b4e2fd1d8f1c46aa7aec0/lazafegu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/29df3c0fcc5a360b4f40302fb537b8fb/85257525154.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/vawoza.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6ac68762---17446486446.pdfIn PDF document text
    • http://billsky.ee/files/file/zosevixu.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/672838e121d526f492a394c039ccf57b/70267670369.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/592f253e630630f31660c9b7dc55da6e/vurelituked.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608958de17342---jamopifuw.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/potufim.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83436b1177---gefirawepavefadawaleg.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82cad62afe---kutugogedupisufoz.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce730151ee---pilirixupalejijifedaro.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2926b96a06---vewebobibusanidubuxoxito.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916bdc16785---kikutofaliso.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/lonaxigilewoge.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/27330175077.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/6cc518db29a82b8be1379baa8e573743/56768513985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=what+the+bible+says+about+judgement+dayPDF 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_off0001315b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001496d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496D 16716 bytes
SHA-256: 81b07f06c95571f550cbdcb93073aad88e9c33db298107c0ce24f5d1d7113637
font_02_sfnt_off000174a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174A7 11072 bytes
SHA-256: 839938cf9c0c04a3b1bd77090c25080fde68ef52acccdedcee944ca2a53f1b6d

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