Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ac2192330d1ad0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-21 11:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12335260ba1952b2f05191962345f007 SHA-1: e1e5f30c72bad01fbf2bb64149f21ec925d5debe SHA-256: 98ac2192330d1ad036963134b15e9e914e953488b2c51130980c98afecbf326e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://brunagabriele.it/userfiles/files/14732676745.pdf In PDF document text
    • https://dobski.pl/userfiles/file/nepobobipamo.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/pixovaposenunilitu.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/vaxatopogigukegikalusaj.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/susoxamojopijamudumataru.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/movolilo.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90559dc46---16737406724.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/jejinikasaxas.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/pelopifogobovirusugeba.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/mukuvinim.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/23061242013.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/54919385934.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_180051.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/c971bbccf6185f3695a93dc0e9f8db15/64332853789.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/c3b8887feb42d19fe57cf477207917be/junafamekupojirawunevet.pdfIn PDF document text
    • https://ratosatu.com/contents/files/damopozasejomewurofomij.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0481e3d41a0193b45b8923921a5dfec4/ruropulajigam.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/poronadekekeranubafenef.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/ximawurajepexetizowud.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/co5jisl0ajdvdm3r881joq6p31/miponozasowizinezuwirasuz.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/jejewebonowigal.pdfIn PDF document text
    • http://boldogelet.hu/media/369600783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=different+types+of+graphs+and+their+namesPDF 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_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 17928 bytes
SHA-256: 11949cd7c8ac4088ad81b2e05a860a1940d9c158c774afc962837cdb6c3d5bb3
font_02_sfnt_off000124cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CF 11016 bytes
SHA-256: e304fd78d2a4a6e96acb5c52c9a6611eebaf9a0f4a98ca30ce3970941529356d

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