Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d3a0a4a36cda02…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 05:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b1d49617c7aa7284fe8608975b685f90 SHA-1: 2fa5b9513aef79ddb57d3972f74d606c8f2b5680 SHA-256: 09d3a0a4a36cda027a51c90d9a81f94c8479405031d72d9e3aee370a2de31004
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://bibliotheque-des-arts.ch/ckfinder/userfiles/files/nilimotudebivibig.pdf In PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/67401180be393458d14b51d173346dd5/70482734231.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/50104364381.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/7deb49a90909de98d56d472514323083/dimosatapekajovopek.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/45689821102.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/mefomumorazovabokiwekiku.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b772761b8fb---81974611162.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29bdd12c34---takugepitunonezobevona.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f082deece8---dafafodelemexitazilasi.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/garijuzebomifi.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/davemanipugeliripasugom.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/fudiwex.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/gabodexefor.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/43236798531.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/66624331261.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/f6953d45ac4914590f734eeeadecc462/pibobumonobezazilerumaxuk.pdfIn PDF document text
    • http://myredm.ru/uploads/file/10027782379.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d939ac4c9---9779647397.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/64069951147.pdfIn PDF document text
    • http://hanleyresources.com/images/lerov.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/089p4cf84tslm5h9jgtdiqb693/47749932089.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16123749f30783---63917403092.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/56819894041.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/2090125145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=alkane+alkene+alkyne+general+formula+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_off0000e413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 10768 bytes
SHA-256: 40b8d7f262c0fcc6efe30a45fbb72efd2c5d7d1d683be9ed85c40acd19fa5713
font_01_sfnt_off0000fca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BB 18064 bytes
SHA-256: 2e15c651164cf887fd49ee5af97e1675c60767450cd773275fd364d3ed8c3fe0

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