Malicious PDF — malware analysis report

Static analysis result for SHA-256 770e562946b75ef3…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 15:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d11b868c2ed8865cd1c6af5bf7edda3c SHA-1: e1eef0353097f05cafa1a3e3a2951e31d1329f51 SHA-256: 770e562946b75ef3d64d8d483bcc60ab8db83b3c56ef2becb9794808299eb786
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://ceramicaartisticamarsalese.it/userfiles/files/57453926466.pdf In PDF document text
    • https://belitour.ir/basefile/belitourir/files/17805116349.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/bupibivakimikivetewa.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613537e2d2c9b---noxebunufugaketumuvi.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/38347440874.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613882ef8dcee---45556307982.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/7rlhe1c5iasu25334nef3620hi/37872444546.pdfIn PDF document text
    • http://orderkai.com/uploads/files/91495827977.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/riwowugilipitabatux.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/pafowubata.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/91716106104.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/dafaputugote.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/15292645756.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134885a4fa5f---44597916079.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/88399137998.pdfIn PDF document text
    • http://dmkert.hu/files/file/pajujugizevu.pdfIn PDF document text
    • http://wjcopy.com/upload/files/pukiwotimonugasunevuja.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/jawesegolepuwelagoviga.pdfIn PDF document text
    • http://domplus.su/userfiles/files/xisopiroxode.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/95290231581.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613783a3948fb---41603120259.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/69599643243.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tesikuzotitesuw.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/vijutuja.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/4bavbkds3idv189dt2rkbi5fl1/koparakepodulilozepov.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161325303cdd1f---46149363327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=finding+area+of+a+sectorPDF 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_off0000d741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD741 18292 bytes
SHA-256: bf515ede3faee5e68382d3bdf5ad6e3d64ae53cb764e4a9ac1ce6b2f74f546a2
font_01_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 10580 bytes
SHA-256: 3fd2a9868a84645b6db5e963e6ce9874341cffea2b1fd5da3f8feae3556639b6
font_02_sfnt_off00011efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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