Malicious PDF — malware analysis report

Static analysis result for SHA-256 891852027666640b…

MALICIOUS

PDF

77.9 KB Created: 2021-09-06 16:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8626e4b52376f693a2fd557f823bf911 SHA-1: cd25d3364f54f3ed557e6c30bd039f7b199fc590 SHA-256: 891852027666640b2c24e6f3d04d69d5b98e5e958b1810fccb892d7bb69c1c43
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and the nature of the hosting indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ltssinternational.com/res/wysiwyg/file/42384685838.pdf In PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/kufijupojogofi.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/39659805206.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/putewebifabezesipuxita.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f42a337dcff941a5546ca1546588bcbd/78746963823.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/mghkmrolqtrl2u9d73p2q7cd8e/jevamu.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/c74a045771d415f4d773ba6c8dcb2967/widodewaxeruzusewatide.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/83491499800.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/74121389334.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740f2a2ecca---babexemofiz.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/5863145518.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f733d509d---xonenunapisasofujarekel.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/61868430231.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2cbe25270---sugapogem.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16100f5baf3b6f---64617623040.pdfIn PDF document text
    • https://keongracun.org/contents//files/80881246.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/89416349128.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/12966270261.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160867d7f72b44---67335046239.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/5ce11bc3f4e806a5269cac741d23fae7/mosuteno.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/vemiponifoxafabolu.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/670b2883ce0b7800243f6d917996e7a9/mimuwabafejudivus.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087a4b283168---tetowevoki.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/guvewajedimazelisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tableau+training+documents+pdfPDF 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_off0000cc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0E 17000 bytes
SHA-256: 69b3ac4e8c7bc6475ac9c4f277fc8f4eace03f2458e2fc1a576f466b7b5e5557
font_01_sfnt_off0000f858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001106f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106F 11168 bytes
SHA-256: 1ce3cf273c22ee8b48ffdb0afd3508e9349473bbfbb0fb8ad5e3239cd5d3290d