Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e275821b6f343ea…

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 08:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b08aa5f7cf762669ec853a9463d73ed SHA-1: 0742aed7f7be65ff6caf6238540d0bcbb204de6c SHA-256: 1e275821b6f343ea82d58b7372e6ddd770b8f26301f393ec2118a5f04c0e68f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://oniceh.ru/uplcv?utm_term=download+sejarah+kemerdekaan+indonesia+pdf PDF link annotation
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608486d8ecb41---depafovotupobagixi.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/19722649879.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/tazolivu.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a4f62330a---62899506175.pdfIn PDF document text
    • http://rosewoodcity.org/nbloom/fckuploads/file/ruwifabaguxutedexevekesu.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/1bnk4rfm26sb07fmcuifo2adou/90621007157.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e5774bc8---punofuke.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099c4e004c40---livariresorekow.pdfIn PDF document text
    • http://thaide.org/userfiles/file/18791735152.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/dekupobaru.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/58d847083e19e3647470ca86e84cb241/vexizolej.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/dazitos.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/76441295849.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/xiwugapisonutetak.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/98985975919.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/piduzabowigu.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/069fe64b49bd414f2d665efa7e0fd66f/65805947446.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/34228bc4321c66d3f62e45122e810003/dotumerake.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/b0775fca757e15d508123489aceec1df/42859328647.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a616f812fb---xuropisapevebinuwixeseg.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d13ab57ce6---87264300412.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/dizun.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/kobupow.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/bivasodag.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/73393306184.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/91234758795.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/2777ad7c0ccf6206706c5d58b195d520/36138744166.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_off0000d035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD035 10972 bytes
SHA-256: 409aae0290310a28f9d82d07cbd9e7f5e19a4ba9dfccac1dc939cc225cafde4d
font_01_sfnt_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 17016 bytes
SHA-256: 356169d612a40c9d988fbddd7c97b8ee2fadd9eca6b443b73c52baaf5a23493c

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