Malicious PDF — malware analysis report

Static analysis result for SHA-256 8248f5503e138347…

MALICIOUS

PDF

71.1 KB Created: 2021-09-18 13:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 84847dc6ba3f0f14fe2ca64769b3c16f SHA-1: 5a5aee3cd927f8f2ed05fd7d5e992b13671a2c03 SHA-256: 8248f5503e138347d7e897a1fff91e560e54e9eb828391ce3f75d0cffca13ac2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting suggests an attempt to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://saiprogetti.net/userfiles/files/tovugekewalumove.pdf In PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/08bccd7b81f836208822ec9f797ab5d9/musimejididufobopu.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/dimimugixikebulet.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321d97d6303---nilisalebuw.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b416b093c---xemov.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/zomajazufupirixuxexu.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/tojoba.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/93816521527.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091818043756.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/rewiwituwederamikuxisimo.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/wupilizegefis.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/47715029301.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/4096035648.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/lurarog.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/68097042003.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/03/file/20210903_073015_159.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/ximetulolimirubugazijomo.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/duzituposirulafudoroguv.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367b2063683---finupuxegapanusi.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/95452230368.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/86168137756.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/66834097909.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/40060837366.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16145b59c63170---neluzeru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=download+obb+call+of+duty+mobile+garenaPDF 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_off0000b4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C2 11092 bytes
SHA-256: 04fc7e38829ed305299fee30baa4ea5fdd55985565d2037f9c65ecd100bc1ed9
font_01_sfnt_off0000ce6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6D 15516 bytes
SHA-256: 1d08e6a4f26e28907ce833866d96b67211c51c9da2fe58c7f28bc82affca425e
font_02_sfnt_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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