Malicious PDF — malware analysis report

Static analysis result for SHA-256 101d3d2c9e1332a1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 16:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb92bc36445f801b37b1c2284c175131 SHA-1: 28237665f97366ae96e88b09fbc67fdfae91f0a6 SHA-256: 101d3d2c9e1332a1dc5022804754184f1e8ced62048a9126263f8b990c6beee2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used for phishing or distributing further malware. The presence of external URIs and link farm characteristics strongly supports its role as a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://inwebjor.ru/uplcv?utm_term=blockman+go+mod+apk+2020
    • https://newcar-rental.com/uploads/files/202109150820061833.pdf
    • https://davidfoleyinc.com/userfiles/file/35161763463.pdf
    • https://kingyao.com/uploadfiles/files/20210912_005437_7086.pdf
    • http://softtox.com/new/userfiles/file/3200094404.pdf
    • https://mami-m.com/Uploads/userfiles/files/37234077353.pdf
    • http://slbreakingnews.com/ckfinder/userfiles/files/litufo.pdf
    • http://brickform.cz/obrazky/files/22525605367.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8f2773000---66562694228.pdf
    • http://datavincity.com/uploads/ckfinder/files/mojuzen.pdf
    • http://cuacuongiare.vn/upload/files/73432625894.pdf
    • http://rucodelniza.ru/userfiles/file/lafuni.pdf
    • http://itemclinicchina.com/ckupload/files/divobip.pdf
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/zopudujetirevo.pdf
    • https://0900107678.com/upload/file/73900453004.pdf
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/valadomuzab.pdf
    • http://booklandbooks.com/userfiles/file/sufekila.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/7f65a9a5a873b2b61999e74c74dae35a/sizale.pdf
    • http://dietgame.net/admin/fckeditor/data/file/20210906141934.pdf
    • http://ttccid.com/userfiles/files/zujufalo.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4ecd1a2db---wiludunozedalo.pdf
    • https://idea-web.ro/app/webroot/files/userfiles/files/73023351835.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16137f12a71b0d---14600892911.pdf
    • http://mtcnx.com/upload/fckimagesfile/27712605557.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134e994ad456---gidisamo.pdf
    • https://eventaipei.com/upload/files/wodegupafelazururupis.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161414652a8257---mazekoxozoralebobi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 16792 bytes
font_01_sfnt_off0000eff2.bin
3069ee0c529baa62e908953cddb4e9f1b197e2cfbe92a5eef52d8d778d72ed9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF2 19340 bytes
font_02_sfnt_off00012250.bin
5f31ab80e4ba2d13137771e3a0a706bd37b41bb7aeb4805ebe62e5773afda974
pdf-font-stream PDF embedded font (sfnt) at offset 0x12250 10652 bytes