Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d93a01cfa11ade3…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 03:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae92f564468a7124a59e9993650eafc1 SHA-1: f91e621fdd0aed1f1f8946ef0e7ea9bb454b891e SHA-256: 4d93a01cfa11ade34c8d54768278090eb254ae69804e12a560c06afefcbcd15e
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 websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URI links and compromised CMS upload links points towards the exploitation of user trust to redirect them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://smidgel.ru/uplcv?utm_term=vlc+android+continuous+play PDF link annotation
    • http://benetalent.com/upload/files/34593481996.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161354532ab260---53557883092.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/34496487905.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/11833542366.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/noxatefubes.pdfIn PDF document text
    • https://conrays.ru/f/data/91097562908.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/22896960650.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090722204673499.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/vegiwatapuwakim.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161351fcd0c10a---62043315570.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/73634483595.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/98619881175.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/63982806881.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/23005186154.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/tudagojazuri.pdfIn PDF document text
    • https://hoalavender.net/upload/files/zutav.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/44675618052.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/97817649059.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bff39c386---16300758387.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/taratog.pdfIn PDF document text
    • http://finchamauto.com/pics/poxerekixakasajaveg.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/mefozanuzunexoko.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/56834631773.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/kerepuralukilulunado.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/radiwowatopibutodiwe.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/44527953328.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/nejogudageg.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_off0000d854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD854 10560 bytes
SHA-256: fe5584ae258f4c2e0deaaf92a997cf8c75d1414dc593d84e6f1dc1fa6cde0d25
font_01_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 18644 bytes
SHA-256: c678b156580ee6e88cb2c44c95ce8aa04b92e52f085c603a7e965d75f8ee813b

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