Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e44defd894ef96…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 22:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f78dba122522e2c5c5472f954fd62c5a SHA-1: 98f3c589891b52cdb28fc86cfb1fff311daa43b9 SHA-256: c8e44defd894ef96411e93e2cd4406f8a91cce52108a8ccf06adae6bcddc8641
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to lure users to external sites for potential exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://huntic.ru/uplcv?utm_term=cities+skylines+green+cities+maps PDF link annotation
    • http://studiopedrazzini.eu/userfiles/files/80450022503.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210913041111.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/96590234645.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/53069078226.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/85202803816.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ce88fdc3---vuterasujatefadow.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/mazubemipinuva.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/pusigoxebiwodubebubogoviw.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109061002297465.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/294f36f8afb0b3945c3d197354f8254f/31342190193.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/eb2e35aef6c5e6ae0583936c80cb8e88/bobosifekekutumasemarib.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ceaebef6afd7c3b9cd1dde75244f69f9/kusamalofelifo.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/gosutegelalemifabozodevu.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/rovivisuminibekineribeji.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/1136805081.pdfIn PDF document text
    • http://schubert-hh.de/image/file/pisatutisakikiza.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/23638489451.pdfIn PDF document text
    • http://mastervin.ru/files/file/29708307850.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/janikonurewuteni.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/3604542079.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/kofugewifewavolofixolelu.pdfIn PDF document text
    • https://es88.tw/pro_pic/files/bisaresatitukarol.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/dinijopawikoxomo.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_off0000d660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE72 17552 bytes
SHA-256: 666a523dddfd6164417b1293fb6341007a67c2449c86d96e7aeb7333e45d801d
font_02_sfnt_off00011c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C73 10832 bytes
SHA-256: 5ff1a05eb36b7a23cc65359d1b46ae641c0919d47b4030be1b429de4afa09d7a

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