Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4d6c4683f4005c…

MALICIOUS

PDF

100.9 KB Created: 2021-09-02 03:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d717b053f15964e4e1e11723b33676f SHA-1: dbf5fe051bb1bfc289aaac43d4ec453c0e892373 SHA-256: eb4d6c4683f4005cb6fac40388275db7a66c835c376ee6df019da633a8d9e661
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://aimecostruzioni.it/userfiles/files/lejizosexizidovijuvuzova.pdf In PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160862f3b040a2---fuvuvonekajetavoduwi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/3057b85709063c0aa6983af9d58b5b35/61141523953.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/38004436735.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb2742b836---3506884966.pdfIn PDF document text
    • https://htchninc.com/d/files/fomilejivu.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/gulifowizuvepekatunuraf.pdfIn PDF document text
    • http://erex.hu/upload/file/11623288533.pdfIn PDF document text
    • http://yuha.be/_files/file/disefosaxasuzozezalesene.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/zoninasin.pdfIn PDF document text
    • https://citytrafik.nu/images/file/67691879180.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24a4dbf70e---23723126266.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16081d6ae99f37---dekev.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/rekawekesusupidukilodiwam.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/mamasamobafuzabixeruz.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cbaf1364841---banataxalukopixaf.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/pasatawagowuged.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/cfa8629f086a7e5a7409bbc14722df11/sobaledetarolifojodun.pdfIn PDF document text
    • http://petrduchek.com/files/56457691085.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/10942331339.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/26880007127.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/bidajoxolosefufuderuzita.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/biletadalulas.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11493e2b78---fosulidok.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/visosikusabusevewemuguvan.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/4aujgc7q1noknts76ir4hm3vga/31763670028.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/bugodosewujoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=howl%27s+moving+castle+howl+and+sophiePDF 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_off00011e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E18 11040 bytes
SHA-256: 05f0cb0c11bff66d33bc4e57dfc6b728f098a93c23e99ab02e0cd2def740a146
font_01_sfnt_off00013773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13773 19776 bytes
SHA-256: 9f670296734f00d3c4222080710da8290aa50039ea09753615d98152fbe0ed27
font_02_sfnt_off00016a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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