Malicious PDF — malware analysis report

Static analysis result for SHA-256 1111eea3e064ebe2…

MALICIOUS

PDF

90.7 KB Created: 2021-08-24 19:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3b0defb41ba602d31af467430108640 SHA-1: d65321681266a13d28cb02530fb8b15177838441 SHA-256: 1111eea3e064ebe219d39f633ead4cd02ab069c6e74cdc66406119670296edcd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and the compromised CMS upload link farm rule support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5e07057a9---todaxunukotik.pdf In PDF document text
    • http://ashokarefrigeration.com/userfiles/file/82423135936.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/78388126727.pdfIn PDF document text
    • https://olterus.org/contents//files/talajidata.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/sgqpev8mktodf1qn9n8jcsuq6a/mikejesokotori.pdfIn PDF document text
    • http://bamila.vn/luutru/files/mobuxef.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e0f85900---80794201930.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/mubowizimawopogutodurebi.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/22218736826.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/dexonidirozamud.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160957ea31e63f---sukodonubudikifunuvorobu.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/bavinumuti.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/18089021258.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/55710008338.pdfIn PDF document text
    • http://caramelitos.sk/files/fasapekugifuj.pdfIn PDF document text
    • https://empirepin.com/calisma2/files/uploads/88638054450.pdfIn PDF document text
    • http://holzbau-napetschnig.at/30763891797.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/1e006c8c23f33a00c3351ceac74e372b/loxewudijan.pdfIn PDF document text
    • https://superpart.com/files/11977556870.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/garalevix.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/7e7dbba3eb95c45dc28fad769401073a/bupufogoxebutojarevixado.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202108181803583194.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bae1a5314---koxufodetukemutade.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/e7284ae28036e52d3674018a48554442/fesozux.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/reroxekeroxiw.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f3ba47c6d39---sigosebimemurukabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=lightheaded+and+jitteryPDF 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_off00010120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10120 16936 bytes
SHA-256: 26eb7117fd086f5b6ac0d6a9b5021037c253a49148ea74db527953cfbe500fda
font_01_sfnt_off00012d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D66 10396 bytes
SHA-256: e2f6b17159cbbb3a1dce3146d2a818fb34956f4dd635e865d6ffbc7655207d28
font_02_sfnt_off0001449f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1