Malicious PDF — malware analysis report

Static analysis result for SHA-256 70215dc458d8a43a…

MALICIOUS

PDF

88.1 KB Created: 2021-09-06 22:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7b6910f6ffd80ac8a11045f619966ed2 SHA-1: 6c9a6d2230514ea716793eee00e6ac529c4fa159 SHA-256: 70215dc458d8a43a7dddae234dc6b041ddfd7ab5e46b24029a0243e55078244a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm directing to numerous URLs, several of which are hosted on compromised CMS platforms, indicating a phishing or redirection scheme. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links and the high confidence detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42372992649.pdf In PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf1a0e390c---52655021231.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/wagugapexobaw.pdfIn PDF document text
    • http://www.puhito.hu/uploads/34154949898.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/mimumudokapanoxepob.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/dibovaxevuzamavibisokefom.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/vofuxowofarazoxibane.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/cde4a0f3a806756e5ef05bd86cc47af6/44465707726.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/72002764694.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/narezi.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d6291e056a2a3672c1d2eaf816cdc44e/1259556949.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/kiwapuvote.pdfIn PDF document text
    • https://matratva.in/userfiles/file/49169468149.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0979db855---89443135116.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/6165879148.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/44328710216.pdfIn PDF document text
    • https://parc-hotel.info/file/75561519490.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/v7tm5kiq94k37d7alho883n0a7/muvorexopow.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160832ae2ae56c---lavasasowibuwumibinikip.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/69925f6991bab3083fcf37447a87d2a4/jazugiwekuxad.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/zedexid.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/wetekiv.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1887b4d78c---tumosirexevubunekuruxo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d13fdd95f9---18642630035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=my+work+is+not+yet+done+pdfPDF 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_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 10568 bytes
SHA-256: 477e88f104a5d4c2260421500b3ff3fad5995a26349a9d55c3446dfd1245d7b5
font_01_sfnt_off00010a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A66 18372 bytes
SHA-256: 1ee41527af9b251e7f7d84a196892aee0ade81a26929cba4e2ec6748c0aa02c2
font_02_sfnt_off00013a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1