Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3dfa6160f2886b9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 17:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e0f60295f9246223736cda35dbd8503f SHA-1: 98c3f7210ca707745dcb6a2f9100cf4452adeec1 SHA-256: a3dfa6160f2886b96b8dddbaa63e36a9bede3b87b643bff0b5477ee81b78dcc1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains embedded JavaScript and numerous external links, many hosted on compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a fake browser update or extension, which is a common social engineering technique to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=android+link+to+pdf+on+home+screen PDF link annotation
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/df4cbdb080d82f3e3bad9de973b80120/93152651417.pdfIn PDF document text
    • http://lagrupacio.cat/file/kidozifomoloxefikurudu.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/subadejunebudodaruvixaso.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/tadotoxuguvoxeluvufefi.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/40228446822.pdfIn PDF document text
    • http://punaide.com/userfiles/files/47398577690.pdfIn PDF document text
    • http://gaudi.tw/upload/files/mokodivuwekuxotafawuxoz.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/nozokezi.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/namemevogirojo.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/edc8efcff10d41211a6075e1678e1b81/linet.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/02/dogixamebowabetitebopakuk.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16131907b32ef7---toladuxavevamijebowuv.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/68255598457.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/35409763156.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/84182513722.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/vazazapop.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/91700866021.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/34159902349.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/61179307381.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/91631018168.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/dosapizar.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/9f0b4d0f42fe1bf52984b2313edc39e6/fobubuwuxudixazof.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/8924514008.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbe5174023---36248435514.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_off0000d714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD714 10796 bytes
SHA-256: 0a304082a3747c5aa285e44862e24fdeeaacbfcfe64e6d017cdcefb863805cd8
font_01_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 17320 bytes
SHA-256: aee9e679bdc97bcf08b9f2cfe8d7bfb257b10dbf71964ee540724eb86e7a5ed5
font_02_sfnt_off00011c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.