Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec27cecc335c1ddd…

MALICIOUS

PDF

77.9 KB Created: 2021-09-03 10:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b9bde94e7048f50344e9a8995e91edd7 SHA-1: 9021dbb0c956f9d4ae1b2258b388d7754e0e930f SHA-256: ec27cecc335c1dddf30cb65fe54f8a50dd1792ccc10a69ab1a3f5046d8dbc8f2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the link farm structure is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://pixomot.ru/uplcv?utm_term=applied+physics+ak+jha+pdf PDF link annotation
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612b230ca8a1d---debefumusirojalodetixag.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/36173501842.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/d3opce24h4hvoq3dhkrv82k4rn/pubexamudopowekerared.pdfIn PDF document text
    • https://europartner2.pl/uploads/gugefejevupamelof.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b333593a097982f6b20b178c66eb3c44/sobamapixusowepidit.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16072fec8c97a7---69247154495.pdfIn PDF document text
    • https://hirurgija.me//files/gakirebin.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/44774475843.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c127e1e84e20549107fa92b7033450eb/kusulepivo.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/6956109794.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160902c37d9488---rufililoxe.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/61c05jk8nllb6l8c6rs6t0hl5c/zudosarovubitizokorus.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/70bedhe49o132ufsttho9an987/70939111075.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726d9b3116a---wagonixedimigupubivi.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/jakoxuzovinagemuvuvotap.pdfIn PDF document text
    • http://ipllaser.in/uploads/jubusirawasoduzerarela.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/90121179260e6d80e625b1.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/753d0273aebfe0e3750943fe8e440305/kobitutiponam.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083edaa3fd52---davafesopefimatovavivowa.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/d39c0m2g354vbt0nn0trgomise/sorurulibatakuvuzefepa.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d536b7fded---87395978479.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/jkbuh61ieus06s1e18jq9am6e5/jesobababuzidejezax.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/5978776522.pdfIn PDF document text
    • 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_off0000cae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FC 10612 bytes
SHA-256: d805b67209521d06bae9ae16ec56be20b9b373b3236fd969cafcb3b9ee4fafed
font_02_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 17844 bytes
SHA-256: e1459449e1dbecdef4c90df63be0b29c267a3bcf2099237fd22efabbf9eb20fc

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