Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd769f676dec13d5…

MALICIOUS

PDF

85.0 KB Created: 2021-09-23 03:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e68bbea58ba85216a37e36cfb20d18f SHA-1: a6768dc3f0b485ddf9e64d6a7a2acc689f894813 SHA-256: dd769f676dec13d589ed3f8c672a2324aaa5e937c2df24665f9295efbdc8f878
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall heuristic profile strongly indicate an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=develop+android+apps+using+java PDF link annotation
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/23157083107.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/nubagotujafamaveso.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144442e99371---38286317027.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/9254931826.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/88402474309.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/7946242316.pdfIn PDF document text
    • http://vecsecity.info/editor_up/divarexukazoworusem.pdfIn PDF document text
    • http://land89.com/ckupload/files/xefedimixowinirokifutil.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/banavamuzusov.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/25107514758.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/girego.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/369dctq3b2omop5k6e1rpaelbh/mukizubanidoxubibuviwon.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc39a47d1a---kitelomutexirute.pdfIn PDF document text
    • http://leeandrewdavison.com/download/94278564243.pdfIn PDF document text
    • http://sayarbobinaj.com/file/98219962507.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/kabuzevofitakomerobi.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/66296283444.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3998b73845dcce3b8c806f57211a4d88/nevokuwuke.pdfIn PDF document text
    • https://ivanamihic.com/files/videwodoputigevebow.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/49645909485.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/39563945846.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/jijupiwafox.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139c50616bb8---61108922772.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_off0000e612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE29 10764 bytes
SHA-256: 672679870b5ea2e6af71a51d9f82b91037bd642785622d6e4f40b26638a345de
font_02_sfnt_off000116bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BB 18192 bytes
SHA-256: 7245d1ebb8d2caf59761804cb16edc932872c58f1d66f592a02d5207fcc21204

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