Malicious PDF — malware analysis report

Static analysis result for SHA-256 009e199013bda132…

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 11:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a523a9aa266dc54ff8ef629f292776c5 SHA-1: c2c855d73bfbbb0151170771578e868a8235496d SHA-256: 009e199013bda132dfca181c48f18a39164cbd3a13ea089c98b2b159727c9909
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it's part of a link farm on compromised or disposable hosting, likely intended to redirect users to phishing sites or download further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sakaryakasaplarodasi.org/userfiles/file/fexuvugoxepizitigobikip.pdf In PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/1alfck6ra9c1hejre6rm19rrgk/xakamavasomipexagunuroluz.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/a04erfnkrfr01p8q83nbru4ibk/sodawarudepon.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/42908180239.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/sebobunosizuvamu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a177ede36---borugukoxipo.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ad5b61ccf464032cdefdb949bbb75243/jufifirazogeredozapa.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/tekakok.pdfIn PDF document text
    • https://motiv8workout.com/up/files/goxanemoxuwukivaga.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/82718082591.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160949d261a43f---bujukugapegabelesew.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/43625100521.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/20906442008.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/66920855953.pdfIn PDF document text
    • http://ruihuitax.com/files/file/lizajuzagemew.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/125ba91850a2d35032cf69e64579f2c4/33677784639.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf38e78761---64244802634.pdfIn PDF document text
    • http://bjjiffy.com/upload/57470846531.pdfIn PDF document text
    • http://ccymgr.com/clients/a/ab/abc9983c1712fd324c9320bcfcf975a8/File/lewelexo.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/31316847355.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/rosugowanata.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/merefowalutumev.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/70665307822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=limbah+padat+tapioka+pdfPDF 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_off0000c134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC134 10404 bytes
SHA-256: 6f948692128c8f1c2bc9a5244e1b5b266fc72d575030389264f4d6213dacf67a
font_01_sfnt_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 17352 bytes
SHA-256: ca6af757babcc986cc6ade4f1ea3c96a9d5ca7366935ca54763d3b8a689c2a13

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