Malicious PDF — malware analysis report

Static analysis result for SHA-256 f269b4dd9716d00a…

MALICIOUS

PDF

91.9 KB Created: 2021-08-05 14:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 996367d14324aa10857e7c6d590e92d9 SHA-1: ea8d12f0c44620278b552c94379c8560c430d270 SHA-256: f269b4dd9716d00af9b269b0607db1fbbbb8f6e800d5799d10137c9aabd55458
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, forming a link farm. These links likely lead to the download of further malicious content, as indicated by the ML classifier and ClamAV detection. The presence of embedded JavaScript suggests an attempt to execute malicious code within the document, potentially to facilitate the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=avast+driver+updater+2.5.6+activation+key+2020 PDF link annotation
    • https://ijpdua.com/contents//files/fuxukijejimumuxajasuvan.pdfIn PDF document text
    • https://binhvi.com/upload/files/wenoregemujarukatogolun.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/92236139775.pdfIn PDF document text
    • http://p-energo.ru/content/file/39936252449.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/xisisirolefiderugiluw.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/fezosidaburuziba.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7212610eb---buniroz.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/15826982479.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/nekawutujifevo.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/1c5e0579a8939a1e8a5dc2804f3a9b2e/lixame.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/bemobapado.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/59196714397.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/40538357558.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/79974689640.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/49922407617.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/kobunari.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/fe266dcec1a031ba360111cc6ade7924/19683337031.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb148db045---fetif.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/9a2a6orphljqh0ssnlpovcrpk6/54606283954.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210718182839634.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-8-1/20210801045151955786.pdfIn PDF document text
    • http://meadspool.com/clients/8/8e/8e46726fd42f39913d2349bbdb4e70c4/File/69076071725.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/67328222589.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/684pc9c725kmutkd1vbmu1j1rl/5585293589.pdfIn PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/15553698764.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_off0000fe89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 11424 bytes
SHA-256: 1bd947903cea410a5cedecc7f18ba7d407cb51ac6b08f7623eea6a28c0b78f9d
font_01_sfnt_off000119c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C2 17212 bytes
SHA-256: cde183b74ea79d9889a1d12481e99f9a737e5fa99177e127056675506426bdb8
font_02_sfnt_off000146e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1