Malicious PDF — malware analysis report

Static analysis result for SHA-256 563e4b0167dfa69e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-09 11:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4291b3c73fe369a1ff741f9c1342a029 SHA-1: 681abf17103f976d59eeab3cd7eb474aa6beaa4a SHA-256: 563e4b0167dfa69ec0aa78d3d906b6deccb243c3e18afb2370c7846a1afd9aa8
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malicious content delivery mechanism. It contains embedded JavaScript and a link farm pointing to various PDF files, some hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious sites or download further payloads. The presence of PRC/3D content is also noted as a high-risk indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 8

  • PRC/3D content in PDF high CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jagamimpi.com/contents/files/83031019757.pdf In PDF document text
    • http://wsystem.sk/userfiles/files/52563511064.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/jc4r020megtcb8las5d1h3cj8t/59154514206.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/82609435742.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/55785687133.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/50905693803.pdfIn PDF document text
    • http://ccadl.com/files/20210909095047.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/tovev.pdfIn PDF document text
    • http://dnepropress.net/files/file/danaminutekinorume.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090912252447.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/supiv.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/88659426040.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/13965262970.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613616a840c6a---pobisarisijak.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/97095781631.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132dddbaa711---48612819744.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/1129743718.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/65904906215.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/31034010089.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/zopisulababitemixagil.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/55786586774.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/3e158804b822d868f560acc6dbe08a0b/86263315047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=wireless+network+book+pdf+free+downloadPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/dugipaxavajupezelilok.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_off0000d156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD156 16048 bytes
SHA-256: d67fa676536cb58d10b2ce3789e75abaa0ca71840df3a58c47398383a1d6d4ea
font_01_sfnt_off0000faaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C1 10804 bytes
SHA-256: 7430e412e6168d2f0282f11ca6a7c0c2649b85add57501be3a02f4c606b8ce2e

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