Malicious PDF — malware analysis report

Static analysis result for SHA-256 399c98929ebdd8f2…

MALICIOUS

PDF

114.9 KB Created: 2021-07-06 21:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e41b251c22e61f2371e1a1ee5fdb032e SHA-1: 014ee1decbb3dd36e14b5006aca58192edcf0ae7 SHA-256: 399c98929ebdd8f2e5c3f319e33ab0894b2b0f65cdf59bc90c03ad32d8284496
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised WordPress upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://garglob.ru/uplcv?utm_term=causes+of+industrial+pollution PDF link annotation
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/slff9jqvu4plar098sn698593g/bavipumatogosanopirige.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/doregasileresukepegigali.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/8277500980.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0835c9d0---18475688889.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/34618035677.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/doxipizevatirugukagifixir.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/15074278537.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/tixowaraketekixukewa.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c0db4fd45---xinimajuzi.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/pivuzodofuwodirariwe.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0e2e55aea---nazakonofowobupokajeg.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///mirizes.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa7b1e4ac8---jaretipubizilapor.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/99954926154.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc433a4f7f---20726527978.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080db0f390c9---36740621465.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/pisum.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/66726098372.pdfIn PDF document text
    • https://arerp.kr/data/file///gifudavekenajulenevoxiwip.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ee0159fc7---13742988471.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wuwuxubutun.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/sunokudoratizuja.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbabab50bc---90688354943.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982313118a0---pifugojabevemi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pbqiqt44t9jh4ldnur2u4ua3h0/37498596904.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_off000161e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E1 16836 bytes
SHA-256: d10979cb45c3aa15931886de2965f3d503e2231484881cdbe3f998600d9c1aec
font_01_sfnt_off00018db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5CF 10624 bytes
SHA-256: f1893b4d7c1e8154213162b4271124b07b0da533efe69a303fbc1143c79170d4

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