Malicious PDF — malware analysis report

Static analysis result for SHA-256 18732d207380462c…

MALICIOUS

PDF

71.0 KB Created: 2021-09-06 03:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 32c643bdca93d76995b90aaca6b851c3 SHA-1: 467c3b73ae6bb0b95df5f18243e5970bd79f3ae2 SHA-256: 18732d207380462c38b9f14b3ff4ae947c7ed3e7ed068bbdb90532ce36f06d11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The file functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of 'utm_term' parameters suggests an attempt to track user engagement, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/454b723d326fef0b7671e2f45f897d03/65736236122.pdf In PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/55136274617.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaa6c1a727---26048170575.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/fasomuvifejobakanarijopo.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/24168345945.pdfIn PDF document text
    • https://stotex.rs/files/rituxiniwokifaropux.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/xasapu.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/belawamefone.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/zowokimubugawonukanik.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/69999651532.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/42115081910.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc84ef726cb---lapiborujexe.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/62343408762.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/65844045757.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f4fd5ef54---83212684446.pdfIn PDF document text
    • http://alariel.be/userfiles/file/24435764817.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tezitogapotar.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/nenonifux.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/45491973787.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076588f25adf---gugibegugu.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/99408210167.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/11936489536.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/sosodadubam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=behaviour+disorder+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D4 10564 bytes
SHA-256: cff97713e923e62f44677064412fe1c966f10f567b3e7e4ce43d7d260ff14a5c
font_01_sfnt_off0000cc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC13 16548 bytes
SHA-256: 9e695741febc5010df626f6048d4daf1957ba0309efb6acbe20bdebb81f6b602
font_02_sfnt_off0000f6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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