Malicious PDF — malware analysis report

Static analysis result for SHA-256 024c4196d8652e99…

MALICIOUS

PDF

74.8 KB Created: 2021-09-07 20:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 74de79e6eb10af79d00f012fb27b7f5d SHA-1: 6b5e321d24ea5e1d8758ced9caaba6d2169f86c5 SHA-256: 024c4196d8652e99faeb5f39d2d0c02839d4970225f0d334da590185fa00a14c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. No scripts were extracted, but the presence of external URIs and link farm characteristics strongly indicates a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=junqueira%27s+basic+histology+16th+edition+pdf PDF link annotation
    • https://tecnicadovolante.com/images/file/tolelujumepidav.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/wagogafikotumixugepafiro.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5ab79d201---69540941825.pdfIn PDF document text
    • https://miruyuta96.ru/admin/ckfinder/userfiles/files/fapirademe.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/70326771307.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb2e21da5d---88784753120.pdfIn PDF document text
    • https://cecprint.com/images/file/5065898469.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/737bc76d0337dd98c2de9c913b46c8f0/66788777027.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210814_705C6C4251E66B17.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dac4a82df---dolif.pdfIn PDF document text
    • http://0851gay.org/userfiles/202107file/2021072923263770554.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/tezipunovifexo.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/2398376835.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9075c7ed253a8f3d6cb22d407bc103c4/vozedosijovexewisogorena.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021828746125941.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f76d32333e---42079185749.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/bc59885e2271f5f5273b44943ae1be14/20781426101.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/xibije.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/91794578377.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8d8b9dd47---roxegexavuselaxe.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/85172583786.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5975ac546a959cd23b7e2ca0bb2fe26e/60567033064.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160e133ecad017---63571152070.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_off0000bec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC3 11644 bytes
SHA-256: 0ab64c16bb6f753dc1a3f3d35b346d5c3a2e8aea8ecaca7af11d44e9208deaf0
font_01_sfnt_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 16996 bytes
SHA-256: 3c15ed60c6a69777823084f98772d446ddf27b43836efaeab6ac3612091d52ee
font_02_sfnt_off0001058d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1