Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba654437db4b622…

MALICIOUS

PDF

69.3 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: 4f468e3f94382429aebf7626987c04a4 SHA-1: 9366ac2de6f23ebd180b3514cf5a73ad009d1dbd SHA-256: fba654437db4b622165e61538e72ef9b355f363ae93be739533dd1ed0f2d9e79
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many hosted on disposable domains or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6872

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.
  • 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
  • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

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