Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad65c5ca86e8dff8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 19:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 268a17587c51f9ef78d68506de72bbfb SHA-1: 2de7d665632ff044a65d2f805d25e4db92d89ded SHA-256: ad65c5ca86e8dff80213e52aaf427974cf6f2ef53ae2cc98c0dada63ae52746f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF's structure and embedded links strongly indicate an attempt to trick users into visiting phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=manualul+inginerului+textilist+download PDF link annotation
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/waxadazigasezagimevi.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/lokemiran.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/1ea89ab5f162417f24aa90d9595ed6be/61883375397.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/nigatiboterat.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c149bf243d9---87341534468.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/mezes.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/rakemaperewisobonifu.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160897003b4d1c---94658908865.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/03eaabb708810da79266b66dda4de94f/75435870159.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a52172a6b62---1788704855.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/zogerudojakadoluluwipak.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/devolejakapereduwami.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d52bb681b0a908d2554a951d137a5164/54787568163.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/votuk.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/55d2bbb0c9e871722277793259cc35a3/6627888627.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab60da5eea---85140955592.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/kipumemiwiguni.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/22820976676.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/zosomemelitemedije.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16083bebb324b9---48337830321.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/27733373007.pdfIn PDF document text
    • http://eichler-kammerer.de/galekizeribuwafalasepagog.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/gagexujirebawamidales.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_off0000dd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3F 17424 bytes
SHA-256: 52b72856898543a924d6aebfd7775b08facacb70618f20528a437b3c2324193c
font_01_sfnt_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 10704 bytes
SHA-256: 069d78e74e8a797dc7a8f9d687f162f7621e2626a0f7b467bc927a44fdb955c5
font_02_sfnt_off0001233f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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