Malicious PDF — malware analysis report

Static analysis result for SHA-256 426578865df698f7…

MALICIOUS

PDF

90.2 KB Created: 2021-06-29 23:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 356e00da90d855888cc17ffe8e7f1638 SHA-1: 4d476393332bfca1c6d945eb436bed4070425263 SHA-256: 426578865df698f7fb968bfa1b27bd451c86d7c9d889e573ab0dc3d1fe811545
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage, suggesting it is used for phishing or distributing further malware. The PDF structure itself does not contain executable scripts, but the external links are the primary vector for attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pui-vital.ro/msg_media/file/peruxodisivafipobaxebe.pdf In PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/o7cemrn8f4t1jep7h8vghcnavk/22088648090.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/369951b9d0479043be2cb3f0f333c610/raribojopiruvu.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16082941833ce0---67549262430.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/25681499504.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b639c66df36---rogolo.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d97e9670ce---lawuv.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/7649294266.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/60120804663.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/doxiw.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/fuvowovuresupujufiva.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210502200153495328055.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b206f0c5d4e---10559579889.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/61527045766.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/rarifuwepufuribonugogefiz.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/kofegan.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/riwalidojenaruxepal.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/tdr50a54ti7tvvj12uvksnn1hh/80108317621.pdfIn PDF document text
    • http://clingac.com/d/files/29508710106.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/cc454589cfb5238ff278f1b97eb5677e/gedametune.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/1d9478a51dcc13f0600af515dc128bed/safodelituwavanarot.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f77498348b4401f773e33db26df5b064/valaf.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16077381b50eb8---bafakoduzopimotimen.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/c654vdh9a4ld80li41s29o4eb3/badovik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=sonnet+18+analysis+line+by+linePDF 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_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 10588 bytes
SHA-256: 1ab73a30592bdcd70cc8c77397759b9be2ed5f3495ebb68969f51c62176434dd
font_01_sfnt_off00011687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E99 16868 bytes
SHA-256: 19fef0d0131f5df6aed9948e7e3a09483d144d0a7d1d096e42ef62ae50f84429

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