Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd85150144de8e9…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 14:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3f5326db88163e607aa7a933c30f3a1e SHA-1: 0406acafcb64d6fd079df887b6011637007e6d6e SHA-256: abd85150144de8e9647d4f411dbea736dfe16e641f816a8660cd88618bb40b77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS upload storage, indicating a phishing or scam lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=how+to+see+deleted+videos+on+phone PDF link annotation
    • http://profitoolinfo.ru/ckfinder/userfiles/files/48304483810.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b58eea2bfa---16430670565.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/96079421736.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/gasavevoronasigamepavetap.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/robegele.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/tomexemekaxabuberum.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/81902816164.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-12/20210912173500904385.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/64492719233.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/gewolatawatatodog.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/sutowadaxalisul.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/71723538848.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/zonoluputezaj.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/19990837459.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/ratikifoja.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/54850882541.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/roduneropidixerejojejabe.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/44934567478.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337ab67ee9e---romefazefudekakubu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161402cf1c2e96---57042452045.pdfIn PDF document text
    • https://hsse.cl/files/povonabiwosifokorali.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/51437624726.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/83604877751.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/sebazezafizupevojozer.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_off0000d7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AB 17376 bytes
SHA-256: 6ff9df71784f74a9597f74a8055f5455919da552321abe83d648a7fa17c3153a
font_01_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 10368 bytes
SHA-256: f7b3bf168d983cfdc478a03e0afcf97b6e91927a609d2002dadd97d65b68bded
font_02_sfnt_off00011bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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