Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd4418d055ebf6a…

MALICIOUS

PDF

78.5 KB Created: 2021-09-22 23:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26b1437e51a81ebed23bc82f4cb8f63c SHA-1: 1cf33a644f7e2820535f000e385d8548a45f9f98 SHA-256: ccd4418d055ebf6a2e9671102b8112cd9dfc3d83ec4f4e422093cfced5d18c12
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via compromised websites.

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 https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/5d25ef9665990edf7c0d813468a6899b/tezopupevudekalewegas.pdf In PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139509898c85---44878412634.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/koserilevuzoxena.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/37721494924.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/sotozojazusefunidikemak.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/11801697494.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/27639001407.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/wumejopenimu.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161485c99b66e1---87390496664.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/48692924151.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/607543768.pdfIn PDF document text
    • https://kawanmto.info/contents/files/75773736130.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/72215275924.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/darejerak.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/93171074397.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/meziperaxif.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/441fc13be948109e67aafecd6fbe044b/lesemawetibasefi.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/1060821012.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/wugorokexutitutegofufebix.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/21494669867.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/41267694797.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/67931786699.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/56868796371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=aladdin+1992+putlockerPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/mozanizorobad.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_off0000c99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99F 10852 bytes
SHA-256: 22d8e98042e82a56dd1bad724b5e860d4ae81669e03ef60ebee35a083396f1ab
font_01_sfnt_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 18948 bytes
SHA-256: 6d11e0e62f7423c5215c85a1d3696abe41346f83044b16ec8626d1620e51dd87
font_02_sfnt_off000114e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1