Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b29619fc936dae…

MALICIOUS

PDF

70.1 KB Created: 2021-10-01 15:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6c3d9abd13feddac9dcc397bc39da2bd SHA-1: f00de242d810f521671e259766d24b0e4f561ed5 SHA-256: 09b29619fc936dae60fc6a4d0143ffb0f4c2276dc5680a5a8d41d9ab8f6911a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting, likely to distribute further malicious content or phish users. The presence of external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coretry.ru/uplcv?utm_term=granny+jewel+xxx PDF link annotation
    • http://tipsclubcr.com/campannas/file/pajoxipofuxemader.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153c353c7d11---podufanavakakabutokefap.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210917185531.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a26904097---21900343490.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/23381416979.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39346297c---76990237253.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d88ec2df3---litobufagajonotawuvepol.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090300521573499.pdfIn PDF document text
    • https://tranthachcaodanang.thicongmaiche.com/uploads/image/files/gewegoroniruniwonome.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/jaxuguziju.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/87914513487.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/85519898701.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/30719130803.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/3557317699.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/bad0cc76c3f11d046263074bf39f373e/fekaka.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614196bacdd1d---dirapuz.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/38599243789.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/bosik.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/77064139974.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/14571093822.pdfIn PDF document text
    • https://almavilag.hu/files/files/82155733478.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/67877960823.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_off0000b14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14A 16972 bytes
SHA-256: b382c381dd0e6a5ded3a42af6cf6e49cf24e47f950eabc4446e1f36c3182808d
font_01_sfnt_off0000dd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 10096 bytes
SHA-256: 4d6480966dae97511d61937cddcdedac371fb8a2bbc06114c78bc5d17adc6998

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