Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc6cd8c1a6ff5ee7…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 17:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 78aeae595946c2cff822f6ea72ed9232 SHA-1: d9e2dbdb0035b1bc840c890736c9a0606a063029 SHA-256: cc6cd8c1a6ff5ee7d438cb7f291a47fc7ce60d2509d650efeceba37d418ce79a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and exhibits characteristics of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. Embedded JavaScript streams were also detected, which could be used to further obfuscate the malicious intent or initiate additional malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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=clase+maxillopoda+pdf PDF link annotation
    • https://advance-pack.com/editor_upload/file/gukewikixo.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/kelososavidejusup.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/robanekodezela.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/24058498440.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7be54f92---68691423856.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/jamixigolasupememodufe.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f6a6646b1---vowuve.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/82492906654.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/nopovitupujosavalo.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/zipimesoramisomatejaren.pdfIn PDF document text
    • https://mo-space.space/web/img/podborky/files/koziwuzisonofixizoduruji.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077c1bb9f897---93668584617.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/52416744469.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/23477741876.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/84018048283.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/zofenakiwufan.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/dck7iisb1in50b4jekp7e4sse7/disufijotaxotagewokimif.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/c274ab242d5ca9a18fbb94c057ffa800/xawekezex.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cda07c93b6---tewijinixozopejuxi.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/63834923985.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/vun4h9jpqucujhnsi5jul51lk4/rikofugojiriban.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/linikikomibolejeresi.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/bunepipejawedizadugezo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780362ece20---12506419555.pdfIn PDF document text
    • http://parentini.it/userfiles/files/rixigoxapirifotovonago.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/mitovomajolukelav.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/qonigabgkc1cbr7ijcuvf65vrm/92969473080.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/84733051646.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_off0000cf3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 17768 bytes
SHA-256: ec0e6be5d0c4a77739f733e2d8db3ab38b31c94f3c8d61240d8297ccec057daa
font_02_sfnt_off0001156d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156D 10492 bytes
SHA-256: c38976e77c212596ad1263c5c76acbd8211a8f924e7f85793b117569583644d0

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