Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad7e8ffa27ba859…

MALICIOUS

PDF

116.7 KB Created: 2021-07-07 01:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 547722d6683d0c09ba6056ade6d3dbb7 SHA-1: 03fc2931a98096b2e7409c8d7d0ffd851c750aff SHA-256: 8ad7e8ffa27ba859ab5e4b731b87eb18b5b1fc335fb9787e5303e9f8ab7aca3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9615

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://i-intelli.com/ckfinder/userfiles/files/bafejewelok.pdf In PDF document text
    • http://ipceurope.eu/assets/file/53025187370.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fdf17bdbd---7627112629.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/92995948592.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/posefeluzowavodir.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e681fd2139---64392340935.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2982b76bed---19394465571.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f5d97121a---88806888381.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210704064234.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/wagugapexobaw.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/bf88dcb102023c5a134b91bb6251cfcc/guwugejasevo.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/muzegeratawisowejozedite.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/53950404425.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/71182753942.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/semevg8ptcib3v02klmi8rpdbi/desuzeboserefefiraf.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/zowum.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/178e656f9cfd6b351b08afc41848112e/wamedikusetakaj.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/gugolilezepom.pdfIn PDF document text
    • http://imi.vc/upload/files/gebuvujunasunapiso.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/s8hf6t4gr3fc0vv489kug5hid4/gakigubujamewosujop.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09d5fa01e6---ropojatudaridarewujupu.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/75d36440c8fd45d3bf68efd6cf7568a5/vugog.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/87956199292.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/73853fbc90fe2c5eb909f3535cd528ac/46193619965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=mastery+of+self+movementPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000140ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AE 3224 bytes
SHA-256: fe5df5a467c8c151a376a03017750c81a3f9a6c6498d6a2ad8225f4575d51191
font_01_sfnt_off00014dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD8 10456 bytes
SHA-256: 9a16ea54ed4e2686f6255b9d603ab053c2e2389dd0a5792126f96c62857c969c
font_02_sfnt_off000165af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DC0 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_04_sfnt_off00019332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19332 18812 bytes
SHA-256: e04678e98233adec11aad583b214b6e70b415d3d42a515aab83d577c1f590823

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