Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef424006628e2e9…

MALICIOUS

PDF

85.7 KB Created: 2021-06-26 22:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 724f0ab855ea216559ec196c2e1c9ac2 SHA-1: 3e5ef81df96405f0e3022800dfa799abe348bc64 SHA-256: aef424006628e2e9d8e6f9e9a5030801563883318f3b6e5ad59769f355a98586
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/r1pv967sjrmsu3ml1669eqedpi/39448827787.pdf
    • http://geodavidepini.it/userfiles/files/kuporesakuzanivewiz.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecc89a98a---tutov.pdf
    • http://promador.pl/userfiles/file/dujorixepuvo.pdf
    • http://polimak.pl/userfiles/file/15406241861.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/eae0679350f0057978fbeaa704f89e1e/tolofajejalajenaludexal.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/q39oveutrcg8lih92s6rht0pr4/36264670635.pdf
    • https://arhometutor.com/userfiles/file/baxajipawetikates.pdf
    • http://atut-biuro.com/uploaded/file/31531448424.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606db4423c96e---14603347979.pdf
    • http://beautybybelief.com/admin/images/file/66641572825.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ticagsv03d89hrq06m00shiuru/99846812672.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d86ea5d713ea8ba4e31c8bec77112c66/bilupezo.pdf
    • http://12shio5.com/contents//files/fepemaro.pdf
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/nipovupawenirezigizebuj.pdf
    • http://pphu-joanna.pl/fckpliki/file/misibuninapijazikula.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd0481b383---botina.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/klsgbd8um60bue3c3k7hdtss0m/saduzegusorimovozow.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cec759cdf18d9ec341048339c97cc3ae/pabobirepefumutor.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956a0b60d32---145158137.pdf
    • https://aawyx.com/sites/default/imageuser/file/22461781916.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eca51f0a3f---xotezebevaxowegibijilu.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160968a8bf342b---81648777417.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=reading+comprehension+for+class+9+cbse+with+answers
    • 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_off0000ea32.bin
fd44b238eca743bab7f841c21f3507c792842883a047e6091411942edc95cf23
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 16468 bytes
font_01_sfnt_off000114d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114D5 16792 bytes
font_02_sfnt_off00012cec.bin
bdb76cd9ba9cd964def958b7c6eb0ced8f99a30ce18a12847adb887f7405d73c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEC 11508 bytes