Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f266d54d686b693…

MALICIOUS

PDF

86.8 KB Created: 2021-08-14 18:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ede01e25579317cb723507848b9f1544 SHA-1: e457109b920f65ac3c54ab604c4559304042d44d SHA-256: 1f266d54d686b6939a5d78a9052d790562297a9c76cbebf097d10e40e793c88e
164 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and a link farm heuristic points towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://instalacje-elektryczne.net/ckfinder/userfiles/files/67150410637.pdf In PDF document text
    • https://stka.gr/ckfinder/userfiles/files/86541955290.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/11056372592.pdfIn PDF document text
    • http://unseretochter.com/images/file/6159174964.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/8478598069.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa5v6bhp5lnpogl21hs00dvsrr/tipisegizasofefafi.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/95146806840.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///52753624492.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zanuberesinowamula.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/66f0d762908de44a081457b96d87b031/wobapusosamesipa.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae13df71e64---12459061583.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160854bf1b6bce---begibotajudiwozujawa.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa5309c01---pekezexapefibeda.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/gezesemazojabebinefuzuwuk.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/56177601138.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/acfe4de8c438e0e330eacdce522ff21d/85363182503.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c07f013932a---58953092063.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730cc141bb3---452545519.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/jinavizuj.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/3eb5305b3be2b43738e8d680c1765416/71727893933.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7a13162c0c1ffba209d8b4a6501eca6a/17264278104.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/bfsc1shuq8fsvh12jjrrvf04bl/jevikefugodawukekozokisej.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/uqocb1hn4lhqe3fb9rerq6a1m7/53292827020.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/27776142757.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/32933610204.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/keven.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723883ce87d---91994581008.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/76027081655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=aaj+din+chadheya+mp3+song+download+female+versionPDF 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_off0000eb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 11516 bytes
SHA-256: 7bbb7a8cb184e7e2680485f386b83d01d54911b260be7073f9ec393b274a1734
font_01_sfnt_off00010631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E43 17224 bytes
SHA-256: e8e4b6042fb3241197ad02e3273bc0de3479554123fa540b621a2eb5ab5bc609

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