Malicious PDF — malware analysis report

Static analysis result for SHA-256 354c929c27719b76…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 17:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c391841158a83e33f5cf56886d82aa48 SHA-1: e12f43353b64c8f138d4f3caa9827474f88b4978 SHA-256: 354c929c27719b7666491324a6a829f7ae976c61618a9867a886da2ebe68a4e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of embedded JavaScript and numerous external URIs pointing to compromised or disposable hosting suggests an attempt to redirect users to malicious sites. The document's structure indicates it functions as a link farm, likely intended for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://queure.ru/uplcv?utm_term=endless+space+manual PDF link annotation
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/pnpdpjvpvh60u5h7nmvoudrq4p/11741023020.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/katosos.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119d9e9343aa---suwuxobodawewonixo.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f3aa894146e---66975584738.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1626912441.pdfIn PDF document text
    • https://luminex.pl/upload/file/69814540466.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/wujipegasuvarivatiwe.pdfIn PDF document text
    • https://rm-parketi.si/uploads/valurilosu.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/lojurudeserowuxipop.pdfIn PDF document text
    • http://samtekelektrik.com/files/99909682910.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/804c314b4bb79eaee9d1b6126e94109f/22683963331.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-07-26/aefaf7dda2a6850508298dd5b29f17bb.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/86556747128.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/funekaxiwapesoregeleluz.pdfIn PDF document text
    • http://acgroupenterprise.com/userfiles/file/33651303117.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/69535901162.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/n89lt6bkea3vmua1idpor3kdn2/tesixogagugakupizoz.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/59607403678.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/580a6656d3abb284fbd61830ed65c151/19964263023.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/xelozikofowuja.pdfIn PDF document text
    • http://polkovnik.su/upload/file/votiketo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160aabae9ee45d---35357954815.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e4f8cc565---bigujapifaxid.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_off0000df37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF37 16756 bytes
SHA-256: 9b56ae56510d520bf018334781e9634579b1a2e483fe9999dec2fc6b7e9896c4
font_01_sfnt_off00010ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD0 10348 bytes
SHA-256: 0bc1226590ffcecd8a1e7b688dea1bd28bae9fa32e16070850417bec7e5e2b00
font_02_sfnt_off00012220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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