Malicious PDF — malware analysis report

Static analysis result for SHA-256 927e5c6e008e99a0…

MALICIOUS

PDF

91.3 KB Created: 2021-06-27 15:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 70f1a11087008a4238521bc5a75ea167 SHA-1: d4ddd44dce0688918ca45a069a98a3388fed9b5a SHA-256: 927e5c6e008e99a055137ae8197c20e61778610a9925d406ad83d4e5355aa160
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate maliciousness, consistent with a phishing or malware distribution scheme. The document body is unreadable, but the heuristic findings clearly point to a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6af30601---samibejavo.pdf In PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/a103ppkg12grc7g33mmmtam277/74422526526.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3fb0cac67---wujegukakemu.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b0f288a00---8930923625.pdfIn PDF document text
    • http://www.bash.cl/media/file/51887527188.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d2c335dfe---52155585240.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/90606760561.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/68489022588.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/dapojonotapalajifejas.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609ead7e6ebd0---tekap.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/bigasabavuvojiluriladupe.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/timixigejota.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/7a5e9f60bc27344175e33b1298a72aa1/17404132333.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/61866616527.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/91464138492.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/89601660176.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608222e6a7e3b---25845950334.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/fnfhjpic44l7t1vvhgadoctqem/rilukezivufinavovimetuz.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/rudusoloduwuxirasuzozaxux.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b20da963439---72259904207.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba5f18af04---bebojusalimapasidori.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/de4dfikpdh45q6vocfdtn1ni23/vulijopaxarodebeverojumad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=indian+books+free+downloadPDF 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_off000104d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D8 16424 bytes
SHA-256: f855dffd59e33915bb847b7ad5674a652b8df0418eaa935b13ffba52aa8ba1c1
font_01_sfnt_off00012fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147FD 10520 bytes
SHA-256: 4ea1a7525c2adf70512057a5cdbe320ead03ac0b9e4dc9f1a72f3d3a4099c8d2

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