Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ecf20e61015e15…

MALICIOUS

PDF

76.0 KB Created: 2021-09-16 22:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8fc27717f1607560515c841aab5144e3 SHA-1: a3f7abce311bb122fc0b8874c25eb5d569b02367 SHA-256: 39ecf20e61015e15b8e1218b20081c55a4f046434af40490b0e1d094dac47227
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise, leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://studio-orlandini.com/userfiles/files/kizusomosotuboba.pdf In PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/fotebokubib.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/49122916908.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/18532154039.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/dexiluvukoxenutoge.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/nowavavejelat.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/tadovusovor.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/nesofaxuvimofezekap.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/mezupoduledi.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/1097905337.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/48858439444.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edf08553bb---jobibeloladodatevo.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/76943891325.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/53313338090.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1fa3bf47a81cf7fd48abc4883a22452f/wevevobusawebiwi.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/fejomeparefevovi.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/35913211330.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/mitonoxuzited.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109061909141836.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/19939688261.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/poluzobagopitad.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/46388559599.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/70145485611.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/13317854553.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/limazunoka.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/monolimeronoba.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/fazigalakimewuwogezokakuv.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613153c9f3a14---8534726994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=undo+snapchat+filterPDF link annotation
    • 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_off0000c63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63B 16796 bytes
SHA-256: 68dcfbb39367ea2c4c68013a6e9e7a514d4116c64ba7c89fcf1c9ff4b4076391
font_01_sfnt_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10932 10724 bytes
SHA-256: 572fd6680f0fc09527a37784f76d709422fae541a90d7ae4cc133151d71aa713

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