Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e16888374f3f23…

MALICIOUS

PDF

78.1 KB Created: 2021-09-05 23:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bfee48c25ff4c8272dbedff33a316be1 SHA-1: b281b5251815eddd7a29efe3ebb337f6b830a428 SHA-256: 34e16888374f3f236009d65653b4c681f629284f21bbc86091340203e1e02df9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute traffic or potentially host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://domeinbeverdonk.be/assets/files/file/33813430246.pdf In PDF document text
    • http://flapboxes.com/userfiles/files/24955120300.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a539d956789---67364995940.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a014276dd9b---zukidaxevinebuputus.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098432411977---vidupukujivezanizofavu.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/luniz.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/fofawusidejukaganasatuvov.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/puravokuzeguzefufakugu.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/27475944002.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/aba9oe97va1c0jr4rqe9f1p7lf/28022618506.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/veguzuxopuxadokevexuko.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/59327122627.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/njbncv0eu1q1f1gg7gpuu26b2p/60970551600.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0f8ffc0e60df90281eb5685e9b5e433b/xikuluwuremavobuditali.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/85167670.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a607ed38e---38684418492.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/temiwulo.pdfIn PDF document text
    • https://yellowstonewildlife.com/dinumezoxozazijepepeg.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/pokiwovap.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-7-27/20210727160003991996.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i614iqdoddeg24krvthdommdb1/poramovilubobiraduz.pdfIn PDF document text
    • http://katachizu.com/img/news/files/10944892701.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/52293287426.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/adf81063a513737d1b26f12d980fb04a/ladijivuxidujaw.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/9deb573f490b9a19c8367b5ad62f8199/zulufujepuzutesotipuda.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d140dbd30cb1e28dd0b1d84ee5651769/zegirutetujaxuxowusep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=alcatel+lucent+pbx+system+manualPDF 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_off0000cde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE5 10660 bytes
SHA-256: 561ccf66e5a7586204d7f0f0118cf43bff6d1ce02f199bb892d5f54d93d54787
font_01_sfnt_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 16940 bytes
SHA-256: 802d4d51877c074d06fc19fffc569c19e0ad0bbce1eeb6df1b019ff7ccb5ab08
font_02_sfnt_off00011225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1