Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd70785875d81e28…

MALICIOUS

PDF

74.8 KB Created: 2021-09-25 16:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 72426b6887cc7c3e03afa5cbb805751b SHA-1: 6f65771c91b007669f8279d1ef2defcc5e67e86f SHA-256: dd70785875d81e28713fefa5ac0a5cd149917ae000f1fee64312113ea5fcf8e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL analysis suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://headrepublic.pl/images/files/jififukupaw.pdf In PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/2b8f96b623b518eeda7d5d72ea5ff527/devuwipunuxikavoxe.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/mefafiviwujuvelunurajugi.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/85895992121.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5b9d8489f---xozovo.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/ranadib.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/vilawawewiso.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/fijexut.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///9543163021.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36168581573.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/wuburawotawuvomojile.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/223edf38eae0c2d69f8386b3cebc9899/nugagotevirunozute.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/30122842055.pdfIn PDF document text
    • http://xn--c1adbeke4asdefy.xn--p1ai/ckfinder/userfiles/files/wujoxoverowoxejibomupex.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/ludawal.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109010952544189.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/kinimesajib.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/sepubamufoxiligudawi.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7dde9d02060efab7fd455943a0fe71f0/mevaruzaxirejemuvusitu.pdfIn PDF document text
    • http://quetthe.com/upload/files/57572771405.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109091106327029.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/26316170629.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/zazatuzudelod.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/94478464122.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141e1e8f0d4f---judome.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/mamovijukud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=don+quijote+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_off0000bd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD51 10392 bytes
SHA-256: 6d933da9cca2b3e01b2b05eec5dee739f73521b77bfee1f9151a380e500cc0a2
font_01_sfnt_off0000d49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49F 18960 bytes
SHA-256: 4ad5fb2d041882defd4fbc415067b4db2a3772a77c1222debab359a36e291c6d
font_02_sfnt_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1