Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea40c2f92afc2de…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 23:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7abf364c55df39b721c58f24af0726f1 SHA-1: 85894ffabc0519e56f2859f5daa18aad986f9bc5 SHA-256: 4ea40c2f92afc2deca625cb49a0b669bd817b4b75871990b834b427ce30d7b86
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, many of which are hosted on disposable domains or compromised CMS uploads. This pattern is commonly used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=cisv+songbook+pdf PDF link annotation
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/mikugabinumekaje.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/rizawetezabikimubi.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/mefasekup.pdfIn PDF document text
    • http://ihdbd.org/upload/files/dajopilavesabulenunow.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/minasinozutijipapominepid.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/19123900078.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/65680552229.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/83647407958.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/32991912275.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87110a161---28105485638.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/5a6e11a265f1d0099e9857604c23e30e/mavesiginif.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd29b981d72---39795811396.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607005d4b4eaf---soladobigemobonibe.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/99542727456.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/bimixipazi.pdfIn PDF document text
    • http://strandedtattoo.net/file/7684426491.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/2cb734b60f55a15aeca110f972c76da2/80885882661.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/jaliwekuzobogikaripo.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/zofaze.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/gukusedepixadit.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/pekiwutujawokija.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/73389872785.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/3219284563.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_off0000ddcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCB 10464 bytes
SHA-256: 5d74be7d26688a6bb7d178754d6d89d6f96cd3a0ef737289215742bd6912ab1a
font_01_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 18728 bytes
SHA-256: 306f748b81c43e91f4f9f2fe9e7eee6b38065aac35d3d2a60c4a2d8814726eee
font_02_sfnt_off000126a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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