Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3faf228ef52c9f1…

MALICIOUS

PDF

72.5 KB Created: 2021-09-27 04:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a1e39676362c9d6189c987dfa4b0794e SHA-1: 6cbd34c669749abcd46451aba8e8d4be7d19a527 SHA-256: e3faf228ef52c9f147d0f492659dfdd51d910d7814474ff4a8c47240ae5fab2c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and potentially compromised CMS uploads. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or scam pretext, aiming to trick users into interacting with these links. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://cructi.ru/uplcv?utm_term=app+hider+apk+no+root PDF link annotation
    • https://linardi.ru/files/file/24974668545.pdfIn PDF document text
    • https://andana.us/files/files/lejuruxorudokup.pdfIn PDF document text
    • https://blgjad.com/upload/files/52063586359.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/87429989679.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/14255472421.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/ragifazatebudefidak.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/gelorud.pdfIn PDF document text
    • http://salwex.hu/file/vovutesotunitogukubovok.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/mebuvozasadefikizasijun.pdfIn PDF document text
    • http://pneusmarene.it/images/file/40423429761.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/rebulep.pdfIn PDF document text
    • http://mp-journal.com/media/file/24493296619.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/gumik.pdfIn PDF document text
    • http://bodamvientin.com/uploads/userfiles/file/4120958367.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/23860753674.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb1160c3f3---32626577399.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/59560167223.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/8657257724.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3604c013e---pegavolexupakuzimesagonu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2593eb3e3e4fcd73702b8683f6eac4b2/xirewemij.pdfIn PDF document text
    • https://artbynela.com/uploads/file/70580358036.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/nevumigijenobibem.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/99704121775.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148708bafc68---zubazizojuworuvofezutu.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_off0000b715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB715 18112 bytes
SHA-256: 8d1baf46d5c8fd29915f2b6e542d12d2d170d8d3dd846c06bb93ac3b9dd4d6ac
font_01_sfnt_off0000e58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58F 10348 bytes
SHA-256: 266d65216778ecedadc69f5725db3563426695a4632772c55c38c664bdddf007
font_02_sfnt_off0000fce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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