Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae12f9c2d907ff92…

MALICIOUS

PDF

85.0 KB Created: 2021-09-05 00:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 721ce940dd9cde19749c4d62f1a8459b SHA-1: 8e1d409dc7112d93063ae985dae890db21412043 SHA-256: ae12f9c2d907ff92fd7297954b16abacde86f4697279e89e1dc6993dcabd221b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate this is a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://c-six.it/userfiles/files/70854887340.pdf In PDF document text
    • http://ferrocom-spb.ru/userfiles/files/buzadiwurulezugewok.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/57c483691d28e07576d899ff13d55110/22898231178.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/5dcb5d6ubu0l7r31u9o3gvq9j7/66021211091.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/69025470703.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c1a0bde6---ziganuwiw.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725727e0adf---wubonajive.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/57400789819.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/witamafaduxaderuwi.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/13189320942.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/sadesedesividadugudovafas.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/59509560878.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/vakexaditeludekufubur.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/80839055589.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/86801196876.pdfIn PDF document text
    • http://teaandtiara.ca/clients/c/cf/cffd5a667a547ddf6f7ed7e454f715b7/File/kewerejalavekimijujubux.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/a785cb7cbb6b21c9f52e066b7511502b/dumegomefavolawali.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/kafalirovub.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e122d4307---fibujuxegirupopuwebu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/5cb79f97cf8c1eecc3c067310a8b5b53/1660888619.pdfIn PDF document text
    • http://garderoba.sk/images/_file/forunibanokoxaji.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/6410248536.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/68464565193.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/56442574141.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/pijupuruxup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=food+diary+pdf+freePDF 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_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 19892 bytes
SHA-256: fde961813675d25d64712b1ea55e3f120bb947cbd92254db91e93239c760c708
font_01_sfnt_off000117fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FA 10168 bytes
SHA-256: e8e796943b8ef3f7b7366270607499a6f6ed9b5930ea8f7ca43165026db99b76
font_02_sfnt_off00012ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1