Malicious PDF — malware analysis report

Static analysis result for SHA-256 493a14e7095ffc7a…

MALICIOUS

PDF

148.9 KB Created: 2021-09-18 17:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 98d7fa0d31d0e216940d5b50c197859c SHA-1: eadf5d78c4951cd796fb66bdf1ef81b6ad39bcfa SHA-256: 493a14e7095ffc7ad1f7b8557224928b3a6166850b29471c3ba3de79f604deac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://crewmak.ru/uplcv?utm_term=what+channel+is+anthony+joshua+fighting+on+tonight PDF link annotation
    • https://hgindustrial.eu/userfiles/files/7040319948.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/0b5ba121bddeed04055455fab4aa8116/nigafuxofakisewulazutak.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/49755971485.pdfIn PDF document text
    • https://fobh.net/userfiles/files/44960709174.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/81761541472.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/linasimigosibiwamiw.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/tezakunaman.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/88563415657.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/44768393536.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416b8dc57d8---wamodorimugivupafozu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161451754cc8c7---82694247322.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/lonazofesafusalajafonuvid.pdfIn PDF document text
    • https://mavibusiness.it/file/50923378867.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/62700029689.pdfIn PDF document text
    • https://luminex.pl/upload/file/63579242818.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/jezerixojijezazubigi.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210916081833.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/83282415164.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/bogomesitenora.pdfIn PDF document text
    • https://auto826.com/uploads/files/kazigasurilibelegalalefo.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/vawajuj.pdfIn PDF document text
    • http://jar-ted.pl/file/76727723780.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/80ad5dc776ba4cbc1ce9d559f4202a6e/15972907965.pdfIn PDF document text
    • https://andrejc.si/files/file/ziguzaxunofotoseperotapix.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/44021054713.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_off0001de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F67A 20112 bytes
SHA-256: a0942d7f991361bf10e4b4f6a9a6091343cebfc1cd87c85067fd60341e0b437b
font_02_sfnt_off00022bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22BC0 10852 bytes
SHA-256: 0d2d368793aaaa2084ee097ea5d8fce8ff8af43e2530ab9282d09ff8f76f7ffe