Malicious PDF — malware analysis report

Static analysis result for SHA-256 5240e708f76b63d8…

MALICIOUS

PDF

86.9 KB Created: 2021-09-14 12:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5ec0b02ab0aa82f407e4cae65689da9 SHA-1: ff90a6e8f3f2c7d5555a9056f01c8f224ddbbcbc SHA-256: 5240e708f76b63d82ae00a3e6cdfc88f2b660d6e67d2e555504a40e906baa6bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://chcial.ru/uplcv?utm_term=android+chinese+app PDF link annotation
    • http://leadershipcareer.kr/fckeditor/_upload/file/10665979620.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/67b4bcbd4b3fffbc99e0f330aacfac4c/62124347915.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/bilozatokofuvodutozapoti.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1c9040810---17468394156.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/25152209186.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/544418590.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/dujorejexev.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/545504789.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/gibolebegalipirisav.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/18276428682.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f11a93f924---95854958768.pdfIn PDF document text
    • https://fratellifurloni.it/file/74182577486.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b81590a594---42896059712.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/wokavuledukugixowodaregir.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/81ad9163c208823c3218ccf196d5be18/pozuxipizabak.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/nagabiw.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/a88e57fa97d67e946cca5c1f3ff6db32/gazivifatumejazon.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/2353069814.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/35014617533.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/gipikavanekezul.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/33856772758.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/vulijexuxofegutiromuni.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/xuzitin.pdfIn PDF document text
    • http://skisun.it/userfiles/files/48503028162.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/93202028103.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/90592647127.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_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 17440 bytes
SHA-256: 2f532dbc72db4581b98410562506031b558a731798dc974c0a735ce4a3a688af
font_01_sfnt_off00011e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0F 10448 bytes
SHA-256: e93383453d7cb1606463fa4ccae9e33f3080b5af982d4667163ed2a5b103172b
font_02_sfnt_off000135ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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