Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e64e1390496227…

MALICIOUS

PDF

83.7 KB Created: 2021-07-16 13:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 43dacc29993b195653baed5a2ac07b1d SHA-1: eda53feef6271ded1efa7c3c54425b5ce9d12a49 SHA-256: 66e64e13904962270855d4e3746c9091f1bef62ce4b6d9e5d8044c3fe344dd48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute or redirect to malicious content. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa633d0dfa---japapojililuvurunabiniru.pdf In PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/efcc5027d918ebe98124f64b648f0e45/73303615867.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/e15c6151a950db3bcdddf606d37cba7b/bubusotejelatuzidiwafer.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/mikncocn6orudevmvjp7ljjvt7/nuvag.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/hdoatk0lgp6072vor8gh58k530/78844421698.pdfIn PDF document text
    • http://artospace.com/pics/file/41369037969.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a88d72ea1fe---rizitejiminodelodidezebe.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/5e40tjuamth4r6tnvvkv3255fj/zasogivibuwesuseludefi.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/23308610168.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/evql432d71u7f5jibsdjt3gp71/94871942485.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e027d6a50---63123071397.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/34482164569.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d2bcbfac438---92540759747.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/957gcpjn84q2tnfoli2prnjsl4/41411140771.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/97000143845.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/e9088f0d25217400dcb4b0e5701ee38f/fozorowepelutoj.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/41564794325.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/jd3sqb8s29bl0f4j1eb7i3g2jj/vobaloka.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e3397f1f739803c334e97a003b23a945/2215226278.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/bagumiwenuzekunazu.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/tiupq1ogq7dubhugi3lrpo9bri/89643905102.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/717b9f14a6b0eb64419532d1156be158/2552552484.pdfIn PDF document text
    • http://armanetti.com/images/sezenonogor.pdfIn PDF document text
    • https://grouptm2.com/contents//files/97905758775.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607097cd4bcf6---79809971909.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607208194ba14---6844519069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=php+mysql+projects+with+source+code+pdfPDF 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_off0000deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 18136 bytes
SHA-256: f854e083577c76d814467f3e7d6cfcfda41ac1f285cb44fb80c67c4f3c9d969d
font_02_sfnt_off000126fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FA 11196 bytes
SHA-256: 8f76ff6b4c32e1f329378babb1a5b48f5f3dfe6e94cdd59f3448dadde3c62a4a