Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab03b5e3d2034ab4…

MALICIOUS

PDF

86.6 KB Created: 2021-07-04 15:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6fedc93fc1dde51a45df2e6e18fe06b8 SHA-1: d9e403a4124fd592b4f78d587bf50aaba57f73fc SHA-256: ab03b5e3d2034ab4369a19db89693d9aa5eca26be86a40c0626d558a692377a9
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://wych123.com/upload/files/46366253921.pdf In PDF document text
    • http://chemonova.com/FCKeditor/file/lowututozakiritipuzowamex.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/76822563364.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080cb1818a5a---86006828326.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bf72c1f32---35276717891.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/32292163356.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca29882158---99992204047.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/3dd3ba65aa0cb71c925e1b5b66f0c2f7/zirifesufofateval.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/garofiliriw.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/voxomitajivi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b352d68fec4---sipegoxusefuli.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/supunijegib.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1386c9778b2c2da319cfa906042276f6/zutogu.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ukt704k4aesds6qeagehbm1oog/86040694418.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/16114870770.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/75511032041.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/de24ff7c02c7cb5862b0631f5e94aee0/pabisafaginupukenedufiga.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/48714425769.pdfIn PDF document text
    • http://computerdoki.hu/user/file/79565481773.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/1482531257.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607236c062480---gogisuzubarif.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/69467634854.pdfIn PDF document text
    • http://guchenes.com/d/files/46203309229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+v+roleplay+androidPDF link annotation
    • 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_off0000e228.bin
02b463b9f9eff3ec11e0243b962a475b0cfbebe2f533bfbfc6758efaaac6a020		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 29656 bytes
font_01_sfnt_off00011bd9.bin
5d0ac2689cfd627d4a76675ef9edd64a98b1ce293c9ab3d74c3d1b4781b0aee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD9 10436 bytes
font_02_sfnt_off000133a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133A2 16792 bytes

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