Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7ab8120302452d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 04:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce28048379779acb04b176c7701bc1b0 SHA-1: 9e445eb9d280a980a52fbf89150ea1577e7b3026 SHA-256: 9a7ab8120302452d45be5429a282e90137d8586658adf798df406d9e46f750f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains a link farm pointing to multiple compromised websites, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the 'SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://oniceh.ru/uplcv?utm_term=how+do+i+get+an+unlock+code+for+my+phone PDF link annotation
    • https://recapress.com/ckfinder/userfiles/files/98151557453.pdfIn PDF document text
    • https://bnovum.hu/downloads/fofatasetawebumigo.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/a7fd405121414fbe9614fc2e8c01ccf1/wamoloxepemeto.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/89496251470.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/hckqjhoskepcu5an2tpvjeq1qd/gekujudutixixetubu.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/99252221122.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/41935259171.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/71405010358.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5215ca711---tipubixarasepitixuwa.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/getiv.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/gomelefijurunetedevu.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/2232539813.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/vizedetaxafib.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143d44ac91a8---90988304545.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/049e2fe968a8498b338090b17559f8fc/53646830475.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/26453153797.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/zozapo.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/satesokujoti.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/72734595994.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/lotamezaxolibapo.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/37623175267.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/vokogak.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/8torpaefb2qss8dnccl4p9ok3l/fetifeselubobekobos.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/62187026942.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/48120520746.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/26793768699.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_off0000dc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4F 18072 bytes
SHA-256: 51f7983a4b3b79b313bc7a253c8bce82051426eaca25237e7d6216e197d15baa
font_01_sfnt_off00010bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EA 11284 bytes
SHA-256: ef885b098e1f734e501cfe53a7e7c8ac0139d902426187729385cea84e3988cc

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