Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6680dd88fa9e37c…

MALICIOUS

PDF

85.3 KB Created: 2021-07-08 01:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 871270b97b0e2a8f654ce8dad0253c2f SHA-1: 53a8fc4ad6556a485ef20046a313a45bed5be4b9 SHA-256: e6680dd88fa9e37ce354f6db4a29c448c4f7f2549d2b57c2fb0aac809acfbb52
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised CMS upload directories or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be the redirection to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://robwalker.net/fckupload/file/99205154871.pdf In PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/uo1dmf5ovmpcdgh8sq6ujapr81/xifufamobezimuvi.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/woxikafekijezisojide.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/86618122568.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/1jllo0r9efe9ojdt4s4hno9f3e/42668348478.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/nopatapijorigasuletoji.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/nifinotanovofor.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/zunim.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/gebekoxebusanu.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/wimixugem.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/ludenoserubabi.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/683ad6950774133a288daec900f01cec/91743850485.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5907e4c41285feb2392711aee469cc6f/49833682510.pdfIn PDF document text
    • https://avvocatoboretti.it/file/61208567232.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b783564ed77---37744000889.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021052821910_1042972266.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d8d941921a43ecc217fca3624e6671e4/49318974602.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/d829deddb67d0e6f63b46fd9845dc7d7/logawapowotinubo.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/fanamubuzonolosumepaf.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/90357226066.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/zaketimitunufuzejuvogixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=smallest+planet+on+earthPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/e2b40c7f2582f6815d8b0d04ac1492ba/nipalojesekatumirabi.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_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E3 17164 bytes
SHA-256: af19ac7c41296400025cdee50bc870f7d83d509942cffd35c93e9d3a6abdc92f
font_02_sfnt_off0001309c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309C 10500 bytes
SHA-256: 65261fff85d73e3a33b2563a7efed6b6206c03f091de48b36ba730f98be30bd8

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