Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4c192c7d6e529f…

MALICIOUS

PDF

86.4 KB Created: 2021-09-02 07:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c1967e7a5ce80ffaa7dd7f565e6f0fef SHA-1: f28a719c6ffc0b9fdfb03c4f7a93265ff7d69138 SHA-256: ce4c192c7d6e529f4d231a23f45ff44858d6530c743272e3c3a89ac2c1a047d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised or disposable domains, indicative of a phishing or malware distribution scheme. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to lure victims through a deceptive link farm. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://inwebjor.ru/uplcv?utm_term=how+to+make+your+slime+fluffy+without+shaving+cream PDF link annotation
    • http://shangrilatheshow.com/ckfinder/userfiles/files/sidasosikuzoxavobe.pdfIn PDF document text
    • http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/sosomogekuga.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/vakibolumedonilalidemag.pdfIn PDF document text
    • http://apcmagon.com/userfiles/44348858193.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160789af497116---38700866747.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/tibatusemilulofa.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/22021881334.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/90042152871.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/koxatude.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/xukijulipopitafawa.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/sidirikawinoxuvu.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/50815961964.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/bamodenegefakojuxuzu.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/fogajibifiwugalosumaf.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/42f2c7bc52aabc634a2b4e5efa09cd5c/xazidevu.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb92cbc623---pokovujabepago.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfedbd50d---65702179374.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/wafige.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/gosematite.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/u5e1f02qa6aa2b25s11g696vl1/fikomiravaluxemaxa.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/7332907966.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160baca90621b4---zobevimesosafaxemi.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/93069534416.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210609_3C2885A8631F22D6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 11232 bytes
SHA-256: 76f95099641253572ae0415940af76b5386fb9d3cee0ad625437a89fd1e02d8a
font_02_sfnt_off00011c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 18088 bytes
SHA-256: 2e22184897ca5ecaa158c4f03efa3779ac26f14d5d4f82197f31a5468d1e38cc

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