Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba5019be79c056a…

MALICIOUS

PDF

85.5 KB Created: 2021-09-20 03:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 879bee2fac53e783ab4e1cde6c896c57 SHA-1: 1ec33194b5d63f3471f592ebb78437a8630b70e8 SHA-256: fba5019be79c056a366462d247cb672ed529ecda8b0791d50c4e816c9b05f64c
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the hosting indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://ks-system.co.uk/ckfinder/userfiles/files/nineli.pdf
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/62412089434.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0c375f41---kovanojabuxuzuxo.pdf
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/22576707743.pdf
    • https://grandiosieventinuziali.it/filesUploads/file/50345297808.pdf
    • https://rajaketiga.com/contents/files/ramuxologejadunepara.pdf
    • https://yourdentist.ro/app/webroot/files/userfiles/files/17388012261.pdf
    • https://mallncart.com/userfiles/files/kuwelomowawovadokutebinow.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146849019bcf---telofejupakof.pdf
    • https://mb-classic-service.de/userfiles/file/sipuxaletiji.pdf
    • http://imdmotors.com/uploadfile/file/2021091007431749.pdf
    • http://duda-tech.pl/dudatech/upload/file/turijalevewafipepewurib.pdf
    • https://mahanakhon.pacedev.com/ckupload/files/39359894520.pdf
    • http://sichera.eu/userfiles/files/64088535228.pdf
    • https://idosekotthonaveresegyhaz.hu/files/files/dosukupizorigopi.pdf
    • http://dalaichau.com/files/45358201832.pdf
    • https://kingwrapcarspa.com/upload/files/rexuwafofomisivebaruxaru.pdf
    • http://pokewaveanaheim.com/uploads/files/87521090845.pdf
    • http://creaorganization.com/depo/sayfaresim/file/supipiwekigol.pdf
    • http://www.insight-assessment.com/ckfinder/userfiles/files/8946927397.pdf
    • https://arrayamed.com/userfiles/file/miwajutotaja.pdf
    • http://erictex.com/ufiles/files/65710172792.pdf
    • http://levne-pohary.cz/UserFiles/File/butasekaxesezazojuna.pdf
    • http://laclonghotel.vn/upload/files/xijiliminazerulevij.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1ec6a72a1---jisigoperakalolafaxapunox.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=which+game+is+best+in+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99a.bin
8c049a09a37b2127698616af769b436d6364b2a8686bea49b88656e43c44ae45
pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 17632 bytes
font_01_sfnt_off0001171e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1171E 16792 bytes
font_02_sfnt_off00012f35.bin
38bccf69a6cc3ef3d8f46c7430607773dc81b16b3a54bdc221e3871fac8b955b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F35 10904 bytes