Malicious PDF — malware analysis report

Static analysis result for SHA-256 d712f1cf88ec50a1…

MALICIOUS

PDF

90.4 KB Created: 2021-07-05 18:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5df66346793987c0571185be6a38262 SHA-1: c9eb5c113fc5a157adef278c8d6740851e5c3721 SHA-256: d712f1cf88ec50a16102f7916d24cb83eb578d5a3d4cd79afa5aa4a9e25cc1e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous distinct hosts, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c42488457---forunejewojozadenuzu.pdf
    • http://islandpointfl.com/userimages/kigoliredilaza.pdf
    • https://twr1115.net/files/fckeditor/file/18612520268.pdf
    • http://www.mezmat.ru/ckfinder/userfiles/files/popobo.pdf
    • http://ccsl.asia/files/tedazapigupawavased.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/7400fc14aeb8640a916e32da003e4ef3/wadojegajowami.pdf
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/36065966003.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16090002f3cba3---deloto.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/590993db1bc62a7e8d47ed9c3a247ba7/tadutafodanaf.pdf
    • http://ailizia.com/userfiles/37916753329.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797a4cebbf0---rufajevuriwive.pdf
    • https://ipic.vn/userfiles/file/virakunebubenopa.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608252dae452b---34526638567.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c7ca9f881---16416476481.pdf
    • https://maconlux.lu/userfiles/files/rezofefidetodilimib.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af2a0007f7---tetejajiwogiw.pdf
    • http://someteme.com/archivos/_20210627010030.pdf
    • http://caigeshi.com/uploadfile/file/2021062709484473499.pdf
    • http://bandenplaats.nl/cmsimages/file/8871107167.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609207534ef64---pisefabujifawomiriw.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/nuvebowamaxeb.pdf
    • http://foodsafebox.com/ckfinder/userfiles/files/47700765878.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ea824d1ec---20810688475.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e156d7428f8---11315623728.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/67169639556.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2f83d6f3a---nasezikelerijofubixidim.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/3ts8hj91rg7d00c4e7tmptoq3n/28651440451.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=wuthering+heights+movie+heathcliff
    • 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_off0000fc7d.bin
e30eaad4c7085afb985e7764b45ed7a95ea9721c659b0b95925801e884b68ec3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 10940 bytes
font_01_sfnt_off000115b4.bin
0ebf12c4b112b664becc7fc82a06f119d9ef65126595c65ea19aef6e04ec836b
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 17784 bytes
font_02_sfnt_off000143fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143FE 16792 bytes