Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a73f71225a8905f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 05:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c8c951ddb6ff57fae7f606dec8eedf7c SHA-1: adc6ecf43ed639db882808b606b76e69df415ac0 SHA-256: 9a73f71225a8905f144368a9e2cbf8f445aeb728573a841fcffe51577e41afb4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs and link farms, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest a tactic of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pixomot.ru/uplcv?utm_term=costa+coffee+nutritional+information+pdf PDF link annotation
    • http://okwmd.com/upload/fckeditor/file/fasobemuwepezudasimif.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109031929579993.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/19025233183.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7145414865---14712402305.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/49934736338.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/beverofeveluduxila.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xiwumewupidu.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/70092133429.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/susopowimimajokinupisu.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mefowaresafiv.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16075e14d83984---wafimamulipumazamed.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e39e9596ff---91225954144.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/samipidejebili.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/0bd0626cada2941c2966578a85334a5b/musaxevobofofixijofosa.pdfIn PDF document text
    • http://dges.in/userfiles/file/xegazomo.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c6b364a8e744f1051fcbc4a33ed65f66/57165259971.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/sosasiruxizasonikem.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/gasetalurudi.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/rugopizonubupotijowirure.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/15157611252.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2e45acf06---vaserezisu.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/3368387127.pdfIn PDF document text
    • http://dsfly.com/uploads/files/sunemodal.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/wubibinokivuw.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a59c98d4617---ginotedu.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_off0000d7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CA 10912 bytes
SHA-256: f27e058ced88546d6d0e5623261b77f118b361881bbf85fc6f1936b61b49114b
font_01_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 18436 bytes
SHA-256: acec7f5eaf9ca6fb3d48c63d78dc678020c57c8fba06d650a8151eb6ff8531a9
font_02_sfnt_off00012043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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