Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be56dec0bb25f60…

MALICIOUS

PDF

74.7 KB Created: 2021-09-14 04:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ddb2b6ac259bd5771a9e7e11e8021b0 SHA-1: 28a65f0b550c2b09d4ee79f7ec937c7383492516 SHA-256: 3be56dec0bb25f60faca4664b2a97b8112433e3b2b8169bb8eeb85ebbfe57003
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chcial.ru/uplcv?utm_term=math+games+bloxorz PDF link annotation
    • https://amatnieks.com/pictures/image/zevitunev.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/9999865826.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/31893867103.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210909111256.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134377bcba9b---gizixovetarav.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/dasejotogixerajane.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/ranedipoleguwuf.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/rikuxorofivakamivumake.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/af1cc3ea05fdec69c7998bad29d8ad71/winikodajezivatowane.pdfIn PDF document text
    • http://brenderup.ro/mm/file/31026775448.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/nilazotowesiwag.pdfIn PDF document text
    • https://norservis.com/files/files/46525302863.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/vodemanegalugagusimefa.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/17823630585.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/44405714494.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/27542898744.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/97024952662.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/judodumiditevemunilumipi.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/28821960199.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/40063072937.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/90118560957.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161318d1055610---toparirasasobiv.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_off0000c21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21B 10656 bytes
SHA-256: d98f5d6dc48fd09bedad6e548d463ca0d41719363a1e4aaaf98a3d2817833541
font_01_sfnt_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 16572 bytes
SHA-256: ac557a4650c70a05a6de70a4fcd52d7db748526b589a362d2f94910bd516e26b
font_02_sfnt_off00010547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10547 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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