Malicious PDF — malware analysis report

Static analysis result for SHA-256 df87a243b4b6db67…

MALICIOUS

PDF

86.1 KB Created: 2021-09-11 05:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: be5f38dcb323af2f7050bd31f5b5948e SHA-1: 6f6a53e1c44a25d2aa0c9ebe4605a414ba804df6 SHA-256: df87a243b4b6db6704441a4cea9cd20a342b5b82a1030f754ac2a4cb2031703f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of multiple external links suggests an attempt to redirect the user to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://baaningdoi.com/file_media/file_image/file/vulenaduxajipezovog.pdf In PDF document text
    • https://uangraja.com/contents/files/kadefapevitipifom.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/xozenetusovinorijesuzobu.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/bujabujubixerat.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/pamumawudixivef.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a66aadb86c---79059948410.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/82719428762.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613970c25b0eb---xinobekimepogalibusowoxe.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138372b48243---gobil.pdfIn PDF document text
    • http://askort.pl/Upload/file/29660116869.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/lujuzunadirijawimokidesof.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090523001660.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/vozulegifatos.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/mirifo.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/15050809863.pdfIn PDF document text
    • https://binhvi.com/upload/files/medakijaka.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/munudetikigon.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/wizoz.pdfIn PDF document text
    • http://yingtailong.com/upload/file/21090921431212098114z0duvgg3fp.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/sinadazon.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/90379d102a49194a95385e915803ddd9/1908073626.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/e7626ce5f9bafd1b17c13a6b67a04ec5/xigalin.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/logawakolemorepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=aplikasi+android+full+versionPDF 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_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 21272 bytes
SHA-256: 26846dbd6cbb87c0d51887dc41364b8afa7d6b87a4dcb2c7f21c9b7bb17637df
font_01_sfnt_off00011a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13226 10632 bytes
SHA-256: e1555b72e1e9e19aa045ba820c75ca42c2f55f20c4441de54373536264be7bca

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