Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e1b2e932cc4c1a8…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 17:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6afc38f86ca6e49347a926bd4abac598 SHA-1: 9bccad620d8012fcb5937699ff145a3f2b85e140 SHA-256: 0e1b2e932cc4c1a8fa082d382beba3eb76d92bbbd4ce20518c8d533ed69f8e24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the document functions as a link farm, likely to manipulate search engine rankings or redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://medvor.ru/uplcv?utm_term=chambers+of+the+heart+crossword+clue PDF link annotation
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d1cf99789236ee32b05b87be37268571/11593242863.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/wojavorisefafupotorig.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/dezarukotagovudifoderowag.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/kejawajovexafikubizibap.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efc8556fc8---jipafalaxulu.pdfIn PDF document text
    • http://holzweiss.at/20060416598.pdfIn PDF document text
    • https://777mto.org/contents//files/fakato.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/86702790799.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/zadopevokeror.pdfIn PDF document text
    • https://foulardfotografando.it/file/tojuxogerumanexad.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/a4c08c64bbdc1603eff0d2699f7fdd6e/17150701874.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/kabajiponumafixorulaj.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/7d82a0d57f14c1dd48424430891bb3c2/79135655011.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/17580297145.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/nizopemilavufodegej.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924a18ae91b---xenofexoxefop.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b4d2f03e46a---88020429182.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/2175138976.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/oe6e1ks5uiiii7mqspjj3ls3ib/kipeg.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/12630243576.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/siduwedir.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/kseefsb5knal35hngi4siiok0p/76714740981.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/4e4ca55842b0181f3b947ad6765db194/puluripi.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/xizixifujakidixowuw.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/d58v2t53ar7si1ov1dl5e04l49/jutosijur.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b7add063c65acc41515e8a4df5db2751/81870835949.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_off0000ced2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 10904 bytes
SHA-256: e7aeb88c1e6df55950a90bd5f9b0490accc4b6ccb1d591d585c4caaa8e4ba2d5
font_02_sfnt_off00010043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10043 20112 bytes
SHA-256: d68fbe9a1861c81e7f42754c09b17a9cd1df1fd3ed1d6a79f139c63132d1362c

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