Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0828890a6b2f486…

MALICIOUS

PDF

79.4 KB Created: 2021-09-21 06:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5301ce715a57139687bc92ca48e5d13d SHA-1: cf4081f485c09c6c8ada0c035bbe4be2fce63b3a SHA-256: e0828890a6b2f486e3f13819552c4a9a7053c6063ab767506b81b64ad61bfd9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to use these links for malicious purposes. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=good+luck+chuck+full+movie PDF link annotation
    • http://yugreat.com/filespath/files/20210907155845.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/99183938558.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/47096384366.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/97529552606.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1632122480.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/48146838777.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///dajifadalevemotax.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/jobusafomibebitozuvo.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/dogitasemolaxifota.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/pugejumisu.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/32167774818.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c039c54acd---vivomirimopuxesonaketonu.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142520ab8fab---tabewifav.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/romakefidopubom.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161359b5737ab3---18095505526.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/69366111860.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/79103172917.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613049b9aee40---43656403153.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/60989258143.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/bapikumajis.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/sonuwefo.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/momarimavokag.pdfIn PDF document text
    • https://kulittelor.com/contents/files/1445742336.pdfIn PDF document text
    • https://alohasafaris.com/files/83407121851.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_off0000d52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52B 16812 bytes
SHA-256: 050db0e0a36f8198513ceb7d5cd8e189795fd86e94c804c7d36e0189046ae0b7
font_01_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 10404 bytes
SHA-256: 68cb6fb09a03ce8b9210052b41c7add673405dc224da3de5020690884f90ebfb
font_02_sfnt_off00011815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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