Malicious PDF — malware analysis report

Static analysis result for SHA-256 71dcc54888777e6e…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 00:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 445f8a198c98436856cd76d83a440716 SHA-1: a741452f785504632dda86df3ffdc600370f2d76 SHA-256: 71dcc54888777e6ef8656515ce5abffefd5be806e6c19253aea77c93abfb40de
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for credentials. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://iseveranscopy.com/upload/editor/file/1717626627.pdf In PDF document text
    • http://piemonteforyou.it/userfiles/file/75706683354.pdfIn PDF document text
    • http://ahchala.com/img/file/84119565489.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f69c2a0d91---bapozilamivimikimisefi.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/gonurepovamero.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/57590211567.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/sewiselolatef.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/zakurosidu.pdfIn PDF document text
    • http://saaretravel.ee/images/file/tabunapegalisusegedof.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f437f18754---26333454759.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/gizijefuxana.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/wolulejuxupuf.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/judefutezavado.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c9e9dd38a---kelizodewamarep.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406325169de---58401266184.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/wovam.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/goviwogelojawelosidumipu.pdfIn PDF document text
    • http://generoussecurity.com/uploads/62466862965.pdfIn PDF document text
    • http://spbi.cz/res/file/jeleruzatok.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/dirozitibokivakiveniporas.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/20337543264.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/devevozakidogivaf.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/95846825217.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/96577988363.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/f5b4010ca40b6673307d47c5f77c78ee/povepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=little+master+cricket+unblockedPDF 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_off0000cdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 10820 bytes
SHA-256: a6c6e6ac57a52127fc5325636e751db82d88e5ee68d7aec9020ab03b2a6d7c0a
font_02_sfnt_off0000fecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECD 16288 bytes
SHA-256: 7f1721e6bfce849f75ac0ee17f171102c468b3582906de16f687606d909b93b8

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