Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d981316bee862c…

MALICIOUS

PDF

77.8 KB Created: 2021-09-16 18:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b6fcc7d14018d12b91d112b795c7768f SHA-1: 347213890aacff162a895f6d8daf5878b6f3703c SHA-256: e9d981316bee862cd6979554c4c194f72ff25ad3b99e193a354f7db07b54e2f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The embedded JavaScript is likely responsible for initiating the malicious activity, such as redirecting the user to a malicious site or downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=how+to+recover+data+after+reset+factory PDF link annotation
    • http://abwvictory.com/uploads/files/37246128189.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/valopawa.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/kuvike.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/68147574269.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/tugum.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/rexulovewobujonimi.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134796fae77c---20064091298.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/79362538216.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/41930894412.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/99766513162.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/fuvudovesijij.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161410d7068f0f---27873054041.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/51250834834.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/zozujaxulusuti.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/tanowekapufijo.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/rapubesid.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/65275227283.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/57686476775.pdfIn PDF document text
    • http://nemalipics.com/5896311066.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16132b7978c56a---43103596870.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/85081128534.pdfIn PDF document text
    • http://www.sczct.com/up_files/file/30547160284.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139a51db4d7d---55043699397.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/ridupasotimuwugafidisadi.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_off0000cd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 17184 bytes
SHA-256: d4f9668ebd5489d1cf0b6a7d22005606c6fa33ca2661505bd58fbea05be3cdc0
font_02_sfnt_off0001114b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114B 10484 bytes
SHA-256: a56a74b9a609dd9325294fa4e55c1998f1ecc61af5588d36adf086213b331b32

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