Malicious PDF — malware analysis report

Static analysis result for SHA-256 9104513b2c2a355d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 16:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 79a70bffdd7ed993dce98e5e64e3d93b SHA-1: d6bc3fd8d14b97c3ab96cd7237e717f0355059e3 SHA-256: 9104513b2c2a355df1d3446fd816066f8cce7f2672ddf760cb4e4eb1796ed9f2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to various websites, many of which appear to be part of a link farm hosted on potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a callback lure heuristic further suggests a phishing or scam-related objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://eko-baby.ru/userfiles/file/74899949516.pdf In PDF document text
    • http://aprt1day.ru/file/tobenofetibudow.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/21785407431.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/11637480828.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c47c91c7ed---wifuwubokezikixo.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/88387019214.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/60592526916.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/56722764875.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109111549151240.pdfIn PDF document text
    • http://fruitvita.com/files/files/joxogofudud.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/18623204629.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/99509835656.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302eb227f34---bafixalovekuliguvururami.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142643cb1b5f---dulufitonosuxanexalolamuw.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/43979100737.pdfIn PDF document text
    • http://melabo.com/upload/files/tubome.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/64390697994.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/20283939013.pdfIn PDF document text
    • https://ijpdua.com/contents/files/posujovemimewujiki.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/vabevotikezoji.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/36771636473.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/3737099076.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/xavozaleximelugenaxuv.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/81723407047.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/surubifadowojixiwimakev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+extend+phone+storagePDF 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_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 18328 bytes
SHA-256: f9cafa099de6743a039a14b5211046a3bfcaf825855aead17c3ea1e50746fa2f
font_01_sfnt_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC7 10712 bytes
SHA-256: 89de93378c9f062bb0b9c5127624fbf00f6d564afef9b47f6e06337b0daa620d

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