Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5f0088dc54f38c…

MALICIOUS

PDF

94.3 KB Created: 2021-06-30 02:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7162f980ccba525cf2e80670213b32e3 SHA-1: 1537a491f541f395a87d8356f4494c433a0e2c79 SHA-256: ad5f0088dc54f38cc13bbca0ad19249894626dbba8a2f9f3769f18296d53629d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. The presence of external URI links and compromised CMS upload links indicates an attempt to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/3pc3h8ja6ql99mgmv53e5htf0c/39484474545.pdf In PDF document text
    • http://shqinze.net/admin/upimg/file///povomotigudeloju.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/efbb7e39ef205f1700da5a6aeb95082d/lekazibovoj.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B3C5D007A8F.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/r0o7gjdejm6b3rkih626mqifvn/bifegikezuvonev.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/51783194323.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a44987337e8---kipoxobiri.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba55055597---gezevodagarizixobegose.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/88151702028.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835c0049074---40072350499.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f1031828774b98449f201387f7cdce11/18669944650.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d276e3dbd9---83683364902.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/pejaxuk.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/fa127bedcff81bcb764b2bbcdb143170/3607081926.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/xedabebitefomoxol.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/8228a2646e3f0f903247521d938c5258/zapawifisem.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/zururezuxuminamudirew.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/59890250063.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607073e96adc7---29391610189.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52699f1718---pibubuvewi.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c77023d60---zoxapotunafiwonavade.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/48328840190.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/limivisenigipuru.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0161df93f---60161526319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mama+knows+best+addison+raePDF link annotation
    • https://mediaget.com/userfiles/files/84047969700.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D8 18868 bytes
SHA-256: c0abe36699176b8660abd6616808bdb630983fb644d6a8f890e60134583d1c9b
font_02_sfnt_off000137f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F9 10676 bytes
SHA-256: 783dcf64d7f1a9ee9f015bd8e59452723d45d33797c68e00387b0114583c0a74
font_03_sfnt_off00015081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15081 17252 bytes
SHA-256: 6d17edc36c5ea45854a330408c453b9bf2ec07e16ee0ea098f0fa41cb1dfad43