Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7162735d28a8de…

MALICIOUS

PDF

83.9 KB Created: 2021-09-09 10:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 93c48887daf54f328087ca6000e46dbd SHA-1: 1edc1ec462fa446bb8654ca812e24c3da97b95fc SHA-256: 1c7162735d28a8de4603b47627f602d375f0ae1da2b3de0e52adb9a8d2a950ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. Several heuristics indicate the PDF acts as a link farm, pointing to compromised websites and potentially disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://apaman.ti-am.jp/js/ckfinder/userfiles/files/38946659795.pdf In PDF document text
    • http://studioaba.net/userfiles/files/22084121472.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613983aa95e03---46141083305.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/welajifasekoxisovujepimiz.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/govazenexasuturupizo.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/66563944449.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/polamusifoxade.pdfIn PDF document text
    • http://fruitsad.pl/images/file/dasuxezufojoligowe.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/xikiwupuzev.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/xexijitatopeduduroxitawos.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/84449316698.pdfIn PDF document text
    • https://bawauang.com/contents/files/tumefofusoforixezolu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613283cf771ed---jiwozireluja.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/3f16bbbd0f37bc7c8b837867418dd390/gogudexewe.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/xofagenitumujiwon.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/97444014352.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130e56663bb4---tufuwe.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/runojojumunisiwitizukuv.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/22617740016.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/xoximovu.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/tovirafokabanefamivipeg.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/25889956741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=install+iptv+shqipPDF 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_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 19264 bytes
SHA-256: 5ba3240fe8564fbdfebd3a98792766b13dbe7408c8c18e9f816238e708bc03ac
font_01_sfnt_off0001135b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135B 10160 bytes
SHA-256: 9c4398eeec639fc002f2f61c0cb6e18f51aa6963d19d0069761373dca3e18122
font_02_sfnt_off000129f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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