Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ed05d572433be23…

MALICIOUS

PDF

88.0 KB Created: 2021-09-04 01:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d757740c5a8a10d59764719949595549 SHA-1: a8baf55c4c9f13268a619299d02b5cbf51acadd4 SHA-256: 0ed05d572433be230df2d1ab56a148895f440c901ed2082ebfe968998f4facfb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript and a high ML classifier score further support its malicious nature. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://nail-free.com/ckfinder/userfiles/files/natepinulivoba.pdf In PDF document text
    • http://hyundai-baoloc.com/luutru/files/71800761870.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928b6eec0c3---13669335914.pdfIn PDF document text
    • http://limoride.net/gallery/file/vigazamoxibisebelen.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1ctb51rknktrgti5lkj4critu0/81028751854.pdfIn PDF document text
    • http://glassick.com/userfiles/file/nufovikunuxoni.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcef6d095f---41967860465.pdfIn PDF document text
    • https://parkettworld.com/upload/files/vekoselezawufapafetorar.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/vavexusofurosipalivanenim.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/du9kfdrr7osn6ghqmge6he33h4/numutigasuto.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/5675c230b5137ffd69ec6310f82210ba/37066427961.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/vawigupeb.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/3299411524.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbcf6588f7---texoxusemujejogofitoxi.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/39356856597.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/xumabowi.pdfIn PDF document text
    • http://sns.hu/_user/file/80159055699.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/6vvhfa0r2ofsjnq0b4f76pa07t/tusafegulurapamisup.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/bimol.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/45368341097.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/47412810901.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/rugapijokalutenusexezi.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/budarodexigukuvezigise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=practice+questions+on+tenses+pdfPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/40361748372.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD616 17880 bytes
SHA-256: 30507ece69cc86634eab9b5bd24727572dda378b26533dd451d96e5eea6d07a5
font_01_sfnt_off00010469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10469 18348 bytes
SHA-256: 7689d43932b439da1bc4e7c95c7f3133dd45e6dbde4b17abd97f646979ebf6b5
font_02_sfnt_off000120e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 10812 bytes
SHA-256: 762a2d1530afc73fe3f7b2725d70c91e0c5755f57306163f769cd8915a2fb4a1
font_03_sfnt_off000139c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1