Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a16b64f5adc235…

MALICIOUS

PDF

71.1 KB Created: 2021-09-04 00:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d431989c6dd546629ede54bbea8cbdd8 SHA-1: ababcaeff83bde53f88b84eaa0b7d0cbf465551b SHA-256: a2a16b64f5adc235fb525d5f1af2bdc8e1d674bf7dae5ff91df20e41353875af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=differentiation+of+self+scale+pdf PDF link annotation
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec49e9f29---dedugebitilojako.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0011f13ef6---6783795350.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/99507700925.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd1252851d---kazifevixopetobefatunabam.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210822012834.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/tuzenojetokegenexusudivig.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c43b1377a---28181121542.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/0f5d08cc5b7ab47907b0deb489b5f022/zijek.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/89601892368.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161108bf7065dc---katupaku.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/r4920eq55upr2jh52gm0qt5mf2/vozobetezakopigigere.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/72556831484.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/059786dd54e36a4030e747c76e6d9ea0/kemekitadakaf.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/zuxaposuripajedisuzo.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/milovojafikutuk.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/663537de47f62350920739aaddd43615/vufevoligiguzuligeba.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c623b0ea17d---leponedujasapaxe.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1kghcgqqab3s8v8cje2e8vba7/96195916291.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/sogujenawob.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/tutomelelax.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/8retkghll2u5nktc7bfo3p8281/35670080153.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/51939759012.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/sosominanejuroxiwiduzut.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/somabixorig.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/9287128263.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_off0000b7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D3 10616 bytes
SHA-256: 2001645c9faef7896e408051532606a4eff5c08d22dab9b99578ca3642d246b0
font_01_sfnt_off0000d02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02F 15192 bytes
SHA-256: 8ced681dc01f2d2a0eb6a3b00469cc86eeffad3d70e2f26087e5ca02dd0979ed
font_02_sfnt_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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