Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7649307cee1a5d…

MALICIOUS

PDF

86.7 KB Created: 2021-09-01 07:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b1bd96757356e26a726ea74efe5e142c SHA-1: e337f2f6b139b4537b3f7de6ac45b1fde68d24ef SHA-256: 1d7649307cee1a5d79d20996418188b41694a4e7f3f794e70424a7ba29315abb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI links and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://krisoc.ru/uplcv?utm_term=spicy+mayo+for+sweet+potato+fries PDF link annotation
    • http://dpnovelty.com/upload/files/jetakavigadalanuvogisol.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d029d708d7b---nizadijafavobikekumala.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/lafifike.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/65872170462.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/vs3b8ia5gvduafd3kt8jj3glir/35138128904.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/91782739998.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/labolasutijazavadunoji.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/bcbd61eabc080df61de1a1df36bd7733/deden.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/2e1dcd553f6317939d0342817b454e27/44339564384.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b69f6978315e4b588ee6bf06387c4a84/gupepibivunaxokalusu.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/20029756388.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/13616536944.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/95065778708.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/tawesepujelikule.pdfIn PDF document text
    • https://btegypt.com/file/59167786188.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fde34a7d206---nuwefijugozevovafu.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/woribodotexi.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/742274304.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/c2215af3622f4671103ca0e25af927bf/gunopibipaguleliwalole.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/manawilezizi.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/tazexurujolivuxarij.pdfIn PDF document text
    • http://bronia.org/userfiles/file/wugutalinepovako.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_off0000ef4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 16900 bytes
SHA-256: 749fe87f9ed18b1ef4081ad85c75b7e18349b6b63a773bd3dbb10ffd5b6ecad0
font_02_sfnt_off00013311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13311 10768 bytes
SHA-256: 569941259e519f4a50de0c703e25ff75c84798e9952d84ec779fa5d9b1f89bce

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