Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6cbfd7a0dcb297b…

MALICIOUS

PDF

86.9 KB Created: 2021-09-02 09:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f47f3083aaa7e6da84180f5f82855ab SHA-1: c14e7cc3dc2f30796bb3350646687bc52774c270 SHA-256: a6cbfd7a0dcb297b9727be5125cc7d911ed908305805b506d28fd500b1bea4a5
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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=aries+second+decan PDF link annotation
    • http://domingo.hu/ckfinder/userfiles/files/54494809828.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3d6ec3e6e---67483577152.pdfIn PDF document text
    • http://poultech.net/d/files/72357606722.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/tiwemisibosogezaso.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/26506087964.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e649dc3711c233e11a7b8ec8c59f0574/59963858626.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/tevojoderawaka.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/mivorasakedek.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/26198666069.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/femilibopebiruluzoripu.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/fn7ito674lvoqjh0bkiqr03cpu/radodegonuximifowe.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/be4d2b70be39ddab9e47515cc87ed1bb/14436427382.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/loxinojuxej.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f7417a4d7eab77fd267fb59335cb0d12/vowaxatilidufuzegerali.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/25ba7fc69a68afe8db0445e95b4f9eb8/disasupijerugi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c9306eaa0fdb79956feb4f705e768652/rajigabujewabusu.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83716122039.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/43807086077.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/82701b1bbe0493096394241cb3a34915/79812644848.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/pimugowozitokusevala.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/bodil.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/kedesiluvedelosarenojixes.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc2c7993e8---56249721185.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/pojimagukomomonofumo.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/04ccb7fc7cc89fafa45cc91148ffd9e1/juvarasumilofanorupezid.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bd4da10be70---96939830845.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c217b52130729c31c5415c7e91e390ea/lapaxovuwagajofuruw.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_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 17896 bytes
SHA-256: 919240273ec169dfa99f1fd2cf33b6bfea5f589848a9b6b1c858deb673ad106d
font_01_sfnt_off00011d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 10200 bytes
SHA-256: d4e50201622a5e8aad8edb4f383b98b5f7fe4ca7e3c4c10362ba7cb515c79205
font_02_sfnt_off00013474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1