Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5e2589faec536c…

MALICIOUS

PDF

109.2 KB Created: 2021-07-30 11:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 50deba777387c5940430ea350887f51e SHA-1: 6f6b04972a47a078710b51b3ca4a0d179e5a8d86 SHA-256: 5c5e2589faec536c6ae3ef5396190c2ff65bcf9e8bd8e73158c6e00459a5a33c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or deliver further malware. The document body is unreadable, but the heuristic firings and numerous extracted URLs point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feeba29c52---zefodixorulisi.pdf In PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079bc97ac1a7---zalex.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/61334236192.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f28888b8a---vamomipariropele.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/0jpjgsb49m95s5mtt948m6qn8t/23176165003.pdfIn PDF document text
    • http://yejida.com/userfiles/file/9538579576.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/wipabasonikidaz.pdfIn PDF document text
    • https://digireg.cz/upload/17581894108.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5b2acc7e3---tibonidunawuborofulugi.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/1296326974270583b97f8b7f5428fa72/femejuxutemadotuvomanubu.pdfIn PDF document text
    • https://asi-filter.pl/files/file/koxigujatufifiluzixunubo.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3d9a6c53ce29884755d92b5ebf24194d/83097701231.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/s7c2danmnd0bohdgput9orgm4h/gedogilifu.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0138a04b81c8d779db77917041f29efd/nuxudumanuzadenekebikazog.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/sigubup.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/28564841160.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607525c128f71---wumekijatik.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/27413347477.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/mupekevoganapugo.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/tifug.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16097b50691edd---tenuraf.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/zavaruron.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f2d4c731---piveparomawekofiramufag.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/76034368693.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/80470582821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=celf+5+pragmatics+profile+scaled+scorePDF 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_off00014748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F5A 17468 bytes
SHA-256: c9944e0834b2a8aacabf667e717de15af4cb1715518919087516f113ffce5006
font_02_sfnt_off00018d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D11 11024 bytes
SHA-256: bf050120e52cff6d15705b65c0584c82af79ebf351d617d5e5c8bcd76adea77d

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