Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0addd55203ed32…

MALICIOUS

PDF

79.8 KB Created: 2021-10-25 14:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 10a7825dd4dc95f6fe922833c715827f SHA-1: 977acaad0fa4295b40323f9f8322623e6d0c8b64 SHA-256: 1f0addd55203ed3240d3713a56d2f9036124d7a470b528b576768e4baf2bce43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Additionally, it features a large number of external links, many hosted on compromised or disposable domains, suggesting a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=utility+function+calculator PDF link annotation
    • https://webmanagement.colortown.ro/images/file/demiwulapeg.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/mamoforir.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///bovezikawedopilib.pdfIn PDF document text
    • https://tsolisp.com/files/file/2807928240.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161612d06c0be9---11903443832.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/gopewur.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/92067499273.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/jupinefalonemili.pdfIn PDF document text
    • http://upakuika.com/img/file/xekeramegegeziso.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132ab55e7c0f---mamatudukulame.pdfIn PDF document text
    • https://phr4u.com/files/kenopeditunuvufow.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/gesaxekatipisijabuse.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613A02C0C63CE.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/demesadosizo.pdfIn PDF document text
    • https://netlandschool.cl/files/luguwororixamijexulaw.pdfIn PDF document text
    • http://africareview.in/userfiles/file/lumezulitagogolenenobuga.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/axaxijivajiliwa.pdfIn PDF document text
    • https://stopserv.ru/files/file/55337806271.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/53d2d92ae43dee06d8d54316a1e85a36/33490469447.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/1e66a3ed67c91bdd18d96a7deac10db8/boponuk.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/vubetima.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/bajuzodosajiloxitizorab.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/64caf5d5c8896da083182381789c4af9/wijoreja.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_off0000d5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C3 10252 bytes
SHA-256: 88be11baab98a94d3eb49176696796d7f363d5d17470508afcde8cf9a721fa04
font_01_sfnt_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 17200 bytes
SHA-256: e32226a135e583d3246e94b8764e52da13a32341a5f5d5a8af611b5a2090a5f1
font_02_sfnt_off000119a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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