Malicious PDF — malware analysis report

Static analysis result for SHA-256 3990b70eb025f079…

MALICIOUS

PDF

88.1 KB Created: 2021-09-17 21:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 03ad54938856201ebf5cac3dcebbc7bf SHA-1: 08c30d07b9e0714fbd9b3f0769d9d178be61106e SHA-256: 3990b70eb025f079d38568e7480435ef89b8da066ed57fd614c2a1c2906bef3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded JavaScript and a ClamAV detection for 'Pdf.Phishing.Trojan' further indicates malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=how+to+play+multiplayer+in+gta+san+andreas+android PDF link annotation
    • https://berbagiangka.com/contents/files/78246201280.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc0f5d49c4---deduxujavowugepogijajuza.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/12539685574.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/25698699158.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/qegaq17veedoenm4pg72na8g4b/zejulabin.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413ab1110ea---getirema.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/lalovusate.pdfIn PDF document text
    • http://buddhavihara.net/userfiles/file/xinudurukorapaxunoramif.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/79668411573.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/rupeg.pdfIn PDF document text
    • https://moolans.com/uploads/files/51479049491.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/wuxonuzamefofetarijodu.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eef47a3c2b---xidovisatuminunol.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/pejodozon.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/26745456903.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/30852893108.pdfIn PDF document text
    • https://resicolor.com/upload/files/faresalikusixugarom.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/kawetolimedabarawawa.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/71945106141.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/zuwirafiremurofinid.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/ligoniroxat.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/33147791913.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/54438573666.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_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 17732 bytes
SHA-256: 97b4cb9b2f9b285291aae864f01ff545e8e3e85147c75338e8202688ee4d0679
font_01_sfnt_off00012137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001394e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394E 11024 bytes
SHA-256: 7a790dcf7892b075022fe9a59e6e2d2debc5d6e14b9d331c70d0d55e34c750e9

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