Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3cd76ca4ce4dba…

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 12:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 899c4be3a00bd31b9dfab12594cd847e SHA-1: abe774dc02983008229a3faddcbe9fbbfa45db83 SHA-256: cf3cd76ca4ce4dba322c221f26ecc9adedc8c468c2bd6e6f872d573568a3a93e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://catamma.ru/uplcv?utm_term=someone+forged+my+signature+on+car+title
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/9irs9uv9v5h0danbgtfal2h345/22444838778.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/a6068c352d0a855628e04740a5dd9849/rikuzugatibexebokuxiz.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afa276d506b---8646723583.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/66225120858.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/zigewuri.pdf
    • http://cheers-gifts.com/userfiles/jibigusewokifezuri.pdf
    • https://limmaginebistrot.com/file/52288671374.pdf
    • http://amy-tsai.com/images_express/userfiles/files/sikirogolulakijikuram.pdf
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/31727658853.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077f4a2d4d99---43620433081.pdf
    • https://heks-tech.com/app/webroot/userfiles/files/69225829125.pdf
    • http://pozitron-s.ru/userfiles/file/20311213800.pdf
    • http://lungshingcentre.com/userfiles/zikamorepusuginetusowulo.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5b0f3464460ec1e99ed88f0c224692da/butimazimazurukeledobaz.pdf
    • http://bong-dem-long.org/upload/editor/files/vagejewajituf.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b28322786b7---4680985683.pdf
    • http://chikatere.com/Upload/files/91352137395.pdf
    • http://barcelonasixtytwo.com/userfiles/file/ludilubinuzi.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/88r6b9h2sjq5eit49f0cs5c9ib/28725012498.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/h27or6qrv0b7a3aagoka2p7avg/10262118445.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16079fd3440ba4---kavemefugusi.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606d13e08487a---sodogufutozulibaset.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da06105dfa---romizepepod.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/xikufisolevagofenige.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F8 16792 bytes
font_01_sfnt_off0000f109.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 16252 bytes
font_02_sfnt_off000106e5.bin
d9e54638f9961c87f6366b04a1b580519cf643c53de9ef1e74bf91b34f42980f
pdf-font-stream PDF embedded font (sfnt) at offset 0x106E5 17508 bytes
font_03_sfnt_off000134b1.bin
8154662e7f7ef2c577ed9fbb7120c97744f53ad7e13e36f30ed7280b4591eaa5
pdf-font-stream PDF embedded font (sfnt) at offset 0x134B1 11108 bytes