Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52a81b022678916…

MALICIOUS

PDF

87.8 KB Created: 2021-08-08 08:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 27cc9956f8ae3db52e1dd071b9c20322 SHA-1: d9c79cf42921996bb60430d7e4b9993a2ee48fd0 SHA-256: c52a81b0226789164f46eda974a32b3e55cfe9a8eae7164da5ab58dbb815a133
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/263f349c052314f359b3844fa09e56e4/tunonixa.pdf In PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160905d1c35215---63047280441.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/kavodemetujite.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080991052dcd---48077528199.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/84963416287.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/vazod.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210724025948_nlcovb.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/75154902134.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/dunutafamizodasuretuwe.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/wepemesefirebag.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/tikozepemo.pdfIn PDF document text
    • https://magerp.org/upload/files/fipuf.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/10661402735.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b2861de24---86249189875.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/xisojuvavutijotujilo.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/vanam.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98648c817---notigen.pdfIn PDF document text
    • http://fohow77.ru/upload/file/kupilimizotukozi.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/85363897504.pdfIn PDF document text
    • https://kildevangen.dk/files/72966619095.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/4uu95hhrll3sl1c05prh8cs836/gelufusapakipafof.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/12309432890.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/94570658009.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/xepiriperulodoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=appsc+group+2+model+papers+in+telugu+pdfPDF 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_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 17340 bytes
SHA-256: d04a9cefa47e594b0e8def61b8e2fb727c705bd96b6713725512921da9495656
font_02_sfnt_off00013681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13681 11164 bytes
SHA-256: 9ef1337eb34e3599a4d1fc3e02ae5669238de3b311024dbae3374f9f22f31629

Open this report in the interactive analyzer, or submit your own file for analysis.