Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51c51828acedce3…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 15:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edfc0a2b59476dcdd4a944a597690ac7 SHA-1: a107543d660334ef2e82c18d4f659617ef5e407c SHA-256: e51c51828acedce39de4d486898bf98dba8b0ce526a22428850be2abf01495dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to obscure the final destination and evade detection. No scripts were extracted, but the presence of numerous external links indicates a strong likelihood of redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://taxplus.in/images/contentimages/files/22470404447.pdf
    • https://rosycaffe.com/file/48619052755.pdf
    • http://3dtechgroup.com/uploads/image/files/nokopusubadofewavijo.pdf
    • https://nakipoglugroup.com/upload/ckfinder/files/sovigupizirosu.pdf
    • http://kvarkeno56.ru/userfiles/file/62566581382.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/7083264003737d825d793f16a1f6313b/4421210763.pdf
    • http://posicert.com/upload_fck/file/2021-9-3/20210903085522351219.pdf
    • http://dj-maily.com/uploads/pages/files/86225697586.pdf
    • https://walkandsmile.com/userfiles/file/nitesugemejulogeke.pdf
    • http://isystem.hu/userfiles/file/tuvepalukebulugagik.pdf
    • http://toyotaquangninh.org/data/dulieu/files/jixitepomotu.pdf
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/nujobumep.pdf
    • http://www.ondebiz.com/userfiles/file/vovexopizotelimegawifawir.pdf
    • http://robedecreateur.com/img/files/zufivijatabopemipito.pdf
    • http://phuwangnam.com/user_file/file/wujuxerom.pdf
    • https://ratodua.com/contents/files/xewajuripibuvufesimoja.pdf
    • https://zivotzaokny.eu/res/file/dokaminefotupajuvugomogu.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613761371f335---rodaroxovupalabibo.pdf
    • https://groupunsur1.com/contents/files/godedufefakab.pdf
    • http://shipagents.nl/uploadfiles/file/9543763673.pdf
    • http://verypool.cn/images/upload/File/90051185294.pdf
    • http://giaydantuongphongngudep.com/images/news/file/41688809635.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613727a19382a---87659532754.pdf
    • http://chipublichouse.com/ckfinder/userfiles/files/63603673484.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613329709aace---23555196568.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cytus+2+apk+obb
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7dc.bin
3e138e3d97a3a3e09308a770e94eaa95a036c889040ec3133a57c9891a251ebf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 18808 bytes
font_01_sfnt_off00010904.bin
1e61c716264b631c8c66547227757c28346d47621647dbb4b321ee993a3d50ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x10904 10368 bytes
font_02_sfnt_off00012088.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12088 16792 bytes