Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b58f545708a4db…

MALICIOUS

PDF

89.2 KB Created: 2021-09-03 19:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc9e1a9b9573dd97133428a257bd6d94 SHA-1: 1b780d6a08477e2a528604b94d7aac5478fb2875 SHA-256: 84b58f545708a4db9a03486effd57cd454c6a9fdbee3120396e1b8aa06677312
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be SEO manipulation or redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://tmtteks.com/files/lidoririmaxemakagez.pdf In PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0078e4f801---68087921939.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b30a6766ad4920347d87a41002b3acb5/41962872101.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/39057121704.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/gaxenoxe.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078da5a4adb8---vibirajakakikiketatiwegaw.pdfIn PDF document text
    • http://artospace.com/pics/file/zasalebafuxo.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/25762646938.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/92299448877.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b976430dac---mukaguraxuvipo.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/nokazefugoba.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/kumadupepavuzoriviv.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/c5cd4acb09ce2de7bcc7982210c46730/pisojimaxodav.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d3daed83f---fojudububotuzenofigeden.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc0594810---71534249737.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/fimasero.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/misijesobodizafode.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4e3cb9ef48fb7694dc4f23d5ee34d580/pebotamigegiposipekutiw.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/55984397508.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062503235217.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53e7fda519---xoxizudilinimom.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd7084ee05---mitekatobojuvig.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/mudinivuvijogixigoxirit.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/igdi0besgh2j2kvs4qofia77f0/41894315857.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/65279790168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=sistem+ekskresi+pada+hewan+vertebrata+dan+invertebrata+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_off0000f92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92A 11056 bytes
SHA-256: 9740dca0b8ae675604f792d3a1c24dd783d6a950b1f84a46edfa91538a114d1d
font_01_sfnt_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 16804 bytes
SHA-256: 28006e70ea39aecce15b74c98b4d67aa16008ff6aa12b6c49aa60c793cd2e9d9
font_02_sfnt_off00013e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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