Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29c8244a56d42fe…

MALICIOUS

PDF

76.9 KB Created: 2021-09-13 12:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8dbef09d2da387bb18be72871424616d SHA-1: 30b82468ea862a42d7b328b6a24ea37a658658ac SHA-256: f29c8244a56d42fe1c8c0163a910b03102e360b83ca50418c0531c21b7643881
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The presence of an embedded JavaScript stream further suggests malicious intent, likely to execute further malicious actions or redirect the user. The ClamAV detection and ML classifier strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cafeau1ait.xyz/js/ckfinder/userfiles/files/88639284252.pdf In PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae9adcd185---mawunujenulapez.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/xipulasilamobosan.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/91551478123.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210909132617.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/sivodorudomumaseb.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/garubunoxijafapebufavi.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/65493656561.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/zijoduxija.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/sabofedokasilu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386b93a5e67---fajoxabinevufekugekemox.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/24995424737.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/75316100364.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/s8o113qh08ho2gf4ssj2l6chtj/31528884291.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a901079d72---mudowefesam.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109052321065755.pdfIn PDF document text
    • http://dsfly.com/uploads/files/99657983625.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/xabafimom.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/monifebej.pdfIn PDF document text
    • http://imi.vc/upload/files/gimasuvesez.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/gijakaru.pdfIn PDF document text
    • http://aurora-c.jp/files/files/51701014451.pdfIn PDF document text
    • http://keramann.ru/uploads/files/suvanojida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=adjectives+that+start+with+o+positivePDF 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_off0000c957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC957 16988 bytes
SHA-256: 3adfc4fbbbde642c12d9124387186cc5e70947c3505feeae814fcd2524686868
font_01_sfnt_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 10724 bytes
SHA-256: 6f4e3fd7b5b201cfaca3c8594c2ecee1827eb15b7c2c14b9849678ab932f14f8
font_02_sfnt_off00010d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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