Malicious PDF — malware analysis report

Static analysis result for SHA-256 214becc55ecff0e0…

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 02:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b57b99c4288e2dbe07a1def3e2baee2 SHA-1: cbd60c603fd2f718883c641fb2000582fd0a1d8f SHA-256: 214becc55ecff0e0be08493c744fd43589717c9633786098eaa6e0b17e5d409d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/7ucvn9f40kenlb6mcaf0n7iieb/29102755114.pdf In PDF document text
    • https://heatingboiler.ca/fck_upload/file/zazaxuwagawalejeg.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81167c49f---jowanexesirir.pdfIn PDF document text
    • http://halmar.info/userfiles/file/wudojezaboj.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/43949569011.pdfIn PDF document text
    • http://farashimirooz.com/files/65424803011.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/xelewisokuwudijopivo.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021061918004382.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/kolaxegan.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609af4c677820---kejotabejis.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/boxezizosatesafes.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/gijelibejuvufipuneteviw.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/781534135.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/44311141668.pdfIn PDF document text
    • http://digifast.cz/userfiles/muwemobiga.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/58750397756.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/b10206a107a817dee160ab8e0338d9f4/84711346769.pdfIn PDF document text
    • https://actorconseil.com/files/file/kipumo.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/kewoba.pdfIn PDF document text
    • http://secretinvitation.net/images/files/91592264310.pdfIn PDF document text
    • https://unosms.us/userfiles/file/58682849572.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c801c71323---kawomiti.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/pizobize.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/42b80ebc717e1bc5c61a5072463da075/73067852968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+boathouse+redcastlePDF 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_off0000c48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48A 17520 bytes
SHA-256: 5727be51bfbb4d40d5c5a0159b8de2aa1da69c0ce2a888bf2a27d68714b28b37
font_01_sfnt_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 10472 bytes
SHA-256: dac44f518bb961ba21bd858531d1b916b99283d8ee795857a2dc54b1c52b4ad6
font_02_sfnt_off00010a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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