Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba9eb7bf8122c9f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 19:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b783d3b158987e51c852eaac9803f24 SHA-1: 6b68cfd672eb06fa327fe56a76f41a3af895595d SHA-256: cba9eb7bf8122c9f72f232d1219e84e54bf1d422fa5f603650702091a008b2bf
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV heuristic strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and does not provide clear textual content, but the URL structure and heuristic firings suggest a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://paradoxine.com/upload/files/19485548972.pdf In PDF document text
    • http://snkpost.com/fckedit_file/file///20210907_11_31_31.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/92864774295.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/kadirukukavemu.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/sonibidugo.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5478b78f7---rebukevokibivipom.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/vimefiwo.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/85711592339.pdfIn PDF document text
    • https://scalper.ir/data/files/file/zinanomaluw.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/29168952344.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/3e2c980a0d9625b8aa3d9f1f87c34801/fulagesesivukewotuxekar.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/noguzimamedonafu.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/salikitulaf.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/fuwuti.pdfIn PDF document text
    • https://kimansion.com/uploads/file/kagumigaxi.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161375c711109b---nixukukakakiwasov.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/82672792657.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/nisawarawufivulogovifebu.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/lujibivoxewagaduwowex.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/tabogubobipinobavom.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/88481585273.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///sirifififamek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=iphone+7+usb+tethering+windows+10PDF 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_off0000d2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFB 10964 bytes
SHA-256: f58a4be38ec49c67b35c931f25903ffef1184b70b9d90d630a8a4c7f0c6cc30e
font_02_sfnt_off0001040b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040B 19888 bytes
SHA-256: 4c57c63febbd570eb312f2dc806c242d4779f0f18a362c8fe8a3a4dd2b3800fe