Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e186b948df0b4c7…

MALICIOUS

PDF

82.1 KB Created: 2021-10-09 07:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01db25b6c4a7b0741654d9c6120a3be4 SHA-1: c8101f502730b545b7e9dfb5c9cf1ebba12beefd SHA-256: 1e186b948df0b4c76c3316dbafa88a7dfab098bd222be79530d9368e3bb22f9d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and multiple external URIs, some pointing to compromised CMS uploads and disposable hosting, suggests it's designed to deliver a secondary payload or redirect users to malicious content. The heuristic 'SE_INVOICE_LURE' further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://agros.net/uploads/file/lowowomu.pdf In PDF document text
    • https://ijp2.com/contents/files/kolinosofuludarariredowo.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/28940244601.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/82258357787.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443aeb1a6ab---fomikinori.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac844914be---vujujorimiferuziwe.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/2500635168.pdfIn PDF document text
    • https://cubic.is/userfiles/file/40242353193.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3984d57e1f89b933124294b91c5d40a4/gaxopebofugiridifu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614117362bc08---57126290680.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/6747679275.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/26354378487.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/bobelejuduxokifu.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/986718703.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/97771772554.pdfIn PDF document text
    • http://195exim.com/datas/files/nupepi.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/sodupoxi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613775784ff4f---91988161562.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/zanawoxegumod.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/xanixaxofatixijetitez.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/joduvilupesipefapebosik.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/36141355058.pdfIn PDF document text
    • http://imoroz.by/upload/file/22166586540.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/xebiletesunebexagab.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/muliba.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/junamemuj.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/delupawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=incorrect+tax+withholdingPDF 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_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 18476 bytes
SHA-256: fbc229252ee4834ce5a57f765da670942760a12789a1b02b2f7bed68b5a079f5
font_01_sfnt_off00010a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AA 10620 bytes
SHA-256: 42540fd7fbd1024101beb711d22e0c9c0e434435a82708aebb644ce0724a5a98

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