Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce8bb85e59611a0…

MALICIOUS

PDF

88.5 KB Created: 2021-07-29 23:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2bef587792d936fb371f38c1d5d719d6 SHA-1: 9d499d30a65a0d664a30a7a9388aefc14d5f253f SHA-256: 3ce8bb85e59611a07614a9209ebd3db69c3e3c6ecef8a3b43669a114fc844390
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous compromised WordPress sites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16102fbaddb160---lisusu.pdf In PDF document text
    • https://viettincapital.vn/upload/files/14808720523.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f132cc37d5---3495241766.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/226a377556ef98e7bbc346986be530d1/juporeduwituzedeges.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/21425588709.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e32b369c9f52dd976925da287ac0f279/6390785074.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adcf463f171---92989619994.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/15211049481.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/tarukolinujozowudov.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca40d773067---ritili.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/mozedasixuz.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/berunezosasexafu.pdfIn PDF document text
    • http://mp-journal.com/media/file/vuluginitasafamizetos.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/765f99f7001544150418f40de58b23a6/towusuvudoropilu.pdfIn PDF document text
    • http://abc-tel.ru/data/File/98904850540.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cee6c56228a---8854155857.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/kexugepit.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/favofa.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/41141213040.pdfIn PDF document text
    • https://isleo.com/i_photos/file/dapefovewadukava.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/m3fj4hd0c4humop2mo33bsdam2/riwamexom.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b2e4cbdf---kezimixukazigesenug.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/279cced2405e95a74f94fa552bd6643d/71328989788.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095eda2d5cff---nobujevolorage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=recep+ivedik+5+indir+bedavaPDF 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_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 10552 bytes
SHA-256: abe25d860ea94d99bfc992584941d020f867695ca920447ef56496283c08eef3
font_01_sfnt_off000108fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FD 19564 bytes
SHA-256: f84a1972a0a6d4cc0e0b1b747915c0df89da5dcf12530c7c379383b98e886454
font_02_sfnt_off0001394b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1