Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9174871d7d390f…

MALICIOUS

PDF

87.0 KB Created: 2021-10-09 19:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 062ec872ecf306492b0d7395a9aae91b SHA-1: 560308f18c2e26d99ee0896e297fde9a9cf240a0 SHA-256: cb9174871d7d390f77ef83f71c8758424141aec94c09fc7dc0ec83a9b3527e04
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The presence of multiple external URIs and link farm heuristics points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=quadrilateral+shape+meaning PDF link annotation
    • http://ideatity.com/ckfinder/userfiles/files/38038713774.pdfIn PDF document text
    • https://longhoang.vn/upload/files/96700776837.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/durixatupexaxanidat.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/69509010085.pdfIn PDF document text
    • http://camonetinternational.com/files/file/gorebu.pdfIn PDF document text
    • http://expresskaliski.info/file/216892117.pdfIn PDF document text
    • https://medius.sk/userfiles/file/katuwezepagomewa.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/63566295048.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/zokimupejeno.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210915_2C8FDC40856597FA.pdfIn PDF document text
    • https://manninghamhouse.com/userfiles/file/16868581296.pdfIn PDF document text
    • http://metroboxservices.com/upload/ckimage/files/70729423795.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/netimaxarejeper.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea5c329324---59343847690.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/91315630725.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/28163540498.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/25536613364.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/tagalutixufigudoju.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/76351765136.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/lolifarukufipupu.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/jugoleponowolilo.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/98461049823.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/gonezazajubefexadalaleja.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ad2b64198652bb999f0199c366385a65/75188151134.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b908f893c3---66022718489.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_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 10876 bytes
SHA-256: 8e9ce296dfb4453bcfa9b448a5abc490658dde7069a49076bc9eb2921421e07c
font_02_sfnt_off000118b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B4 20284 bytes
SHA-256: 49bbd375e8df3c8fc81c3429bcbbe430964b7e54ca7dd950483d7156b79709d5