Malicious PDF — malware analysis report

Static analysis result for SHA-256 874c3675b360d6cc…

MALICIOUS

PDF

90.7 KB Created: 2021-09-05 15:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fa2eb5c6a597439d8e8976aeb84eee90 SHA-1: 275675e24ec3f56ba40e83711130491ec4d57f35 SHA-256: 874c3675b360d6cc598cbe9c442d123efbf5970afe573766c6c92e2425058721
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of phishing and potentially hosting malware. It contains numerous links to external sites, many of which are hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content or downloads. The presence of a 'download button' lure and callback phishing indicators further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://nyett.hk/uploads/news/files/depukin.pdf In PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/837db6ef0cabc7d0c80e6197c311355a/derowugitezukagexoza.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/23813554994.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d77c297576---jenaza.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610905cf20db5---nopogogilexasidux.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/61998000906.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fae8f367b---54210445181.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/85532132028.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/wububemowavebogafil.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/nuludov.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/361c34d184ba1109d51154f978459f51/6531070254.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/93063188586.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/68026437993.pdfIn PDF document text
    • http://fini.hu/userfiles/file/rawewudozukefatexogum.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3b23535758a8b0755fcb9de3008624c/gupir.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/nefurese.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/dotakuti.pdfIn PDF document text
    • https://waroproject.com/file/84778376300.pdfIn PDF document text
    • http://learningkey.org/userfiles/wilod.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8df5547fab---gafazivo.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/2700692028.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/0g4c6535s3kuigk9ldnuurba7v/defutera.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/wulowenafarewut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fill+in+the+blanks+with+suitable+prepositions+worksheetsPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F2 10744 bytes
SHA-256: 9231de2ae96d8429b3717ae164694670b340e8f12902e0a9287e30af5545a520
font_02_sfnt_off00012c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C60 18448 bytes
SHA-256: f60c080f97451468676b9aa440596ea885a542d8be35f0a8daa4747d6755ffd6

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