Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd174fc1bbce399e…

MALICIOUS

PDF

86.1 KB Created: 2021-07-17 13:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 322ed86d351eaac4033942c564a344e6 SHA-1: e84c4c65d1f393a3de450dfe22dcb90dae54d5c4 SHA-256: cd174fc1bbce399e433ff41e4b9355b6fdce4584f09964161e26645cde87c052
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm with numerous URLs, many hosted on compromised CMS upload directories, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the link farm and the overall detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/vebubofigowedorage.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ac6423b76---81692123284.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/627356daf948110c42ae7ef97eb3e832/54324254677.pdf
    • http://stardentalcare.org/userfiles/file/53592071546.pdf
    • http://senn1962reunion.com/clients/2/2f/2fc2c703930c5c120d54ce0350dd22c7/File/49801781807.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/76432a0225d21636f0974832fa28538b/62886170603.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608159c010968---62539674490.pdf
    • https://biomedchita.ru/imeg_master/file/vinipedap.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8c2e689c---6686854944.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/l028pamfo0h8jh7fn55tjg7q89/12012205878.pdf
    • https://majubesar.net/contents//files/kesil.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779a3743456---kopeta.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/15990240757.pdf
    • https://btcauction.vn/hinhanh/file/40729648944.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/relipekaf.pdf
    • http://banquat.com/userfiles/files/popir.pdf
    • http://www.hgbehringer.de/img/files/files/vapexen.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/8c5168aaab2dd33368d5fa408d7fa893/18597157902.pdf
    • https://malabarmail.com/ckfinder/userfiles/files/63469692740.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31ef5ea190---fibap.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51e8ef113c---43239439616.pdf
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/23756333771.pdf
    • https://florerialafloresta.com/ckfinder/userfiles/files/zituwoxuwagajej.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/bbae638f5112368f2c64d83c92613bf1/zisesixuzeku.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=healthy+coconut+frosting
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea34.bin
2f68cae71b48b60880525afcc77eb3cb327dc5bbdb8267575e096fcfee76c5b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA34 18024 bytes
font_01_sfnt_off00011a2d.bin
51a5c9919709e35d15f19898dbb912480365e08fbafec83b39058b4cca66da8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2D 10820 bytes
font_02_sfnt_off00013318.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13318 16792 bytes