Malicious PDF — malware analysis report

Static analysis result for SHA-256 df43849c824be012…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 05:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 84d1ade9eb4b4ff8c4d3bf9252767716 SHA-1: 8a1c23b2822ce5eff7f403208520ccab7a3e95a4 SHA-256: df43849c824be0124ec96e99a659cadb97455dd6f0046d13d33a0508c2d284da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the presence of numerous external URIs and the nature of the heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.eventoptik.de/upload/files/megokinotojovuwezijuvogud.pdf In PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099edc0d0d1c---65916119945.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/eb78913981160c366d09ed36be1d48b0/jezuxaponomitezopab.pdfIn PDF document text
    • https://advik.net/userfiles/file/kizuweduxebetewovurezagif.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdebd432b7---vapeparako.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c62c2e0f23bd4d07aead98f6f5111625/58434569842.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/96416609018.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/4g3fbij37j9s28hu3rbk4920m7/dozegemudaweraxa.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pp4gcbje9n0jhccap39fk803k1/niligu.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/81073008309.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/10852642509.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/xonemalanogus.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/9f621494f505d9b8a728331b2b0324af/83450259730.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/wenuxevufakizizosubivuna.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/93c9713e4e14721dcf30bb9d0e10b455/10907177024.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/75307949487.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/mavozejikijote.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125107d79a56---5517973008.pdfIn PDF document text
    • http://bdn10.cz/files/file/83869745312.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/wobokoxepejiwase.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f098ac20b28---63379489235.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612dd00b3e334---446062350.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/85949764196.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/60437642016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=university+physics+14th+pdf+downloadPDF 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_off0000d1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F2 16968 bytes
SHA-256: 7e0bd9edfafc0eb4224991b7fc974a01c3b3889e1af4487189be4eaf43124d79
font_02_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 11120 bytes
SHA-256: 62401dac504022d5f4acbf03809b8ea77d742f0a75c47da2dee141d66c8d7536

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