Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d989784d45efac…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 09:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 59964d81b8673c274a50f499eebc940a SHA-1: c34a11377036ca3e5c33af938d310326df6a4c51 SHA-256: 15d989784d45efac8d83a116742034a6b40e5e97302426ee611cd0f7bbf19625
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign, likely using embedded JavaScript to facilitate the redirection.

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://garglob.ru/uplcv?utm_term=fewer+and+less+worksheets+pdf PDF link annotation
    • https://equantumconsulting.com/files/files/41440286330.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/85917502092.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/51pdk89uh1e9rdipbkniiuvgm6/vifotuzudinozibi.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/19365370134.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/jowiviz.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/00d84f8e9caba1ce3e7885daa8fa817d/dujakuxokamirumop.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/o3drsq6a482pc7atv2to6r4pit/zewowe.pdfIn PDF document text
    • http://wenxuezj.com/images/File/kudibexipunovoleraxabugo.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/piwivomasovotomuzimugugow.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/59259606577.pdfIn PDF document text
    • http://ubest.ru/images/file/sositefe.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/1718094770.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/79d15e42c62598976b8b8f51549453c0/winatavaruresamivaf.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2a23e9789b18eb3cf20949c6db07617d/26926174211.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/23930204855.pdfIn PDF document text
    • https://okazionche.com/files/tewat.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a683d03e58a---pevofuzu.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/thham4qp0cravul3t5q8j724q7/56071305197.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/a4b1c7274c5331361722ea3dd5669262/jetepud.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac270cad2a---petuzanosoripifuluxetedi.pdfIn PDF document text
    • http://abwessex.com/uploads/files/33201619198.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed079aad88a---15247645836.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/nofamazevamizoxiximutu.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83768847382.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/64ec2d5805ad944cbf78cacea56cb3ca/bibugezanozi.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_off0000d821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD821 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 10656 bytes
SHA-256: 93bde3b34748e12a00cd59b7ecac81de7e79ffe4058d3b9d33cf24afe3a00305
font_02_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 17504 bytes
SHA-256: 314d8f1d3350b0bc6892dae528011df43aa42ebbd07ffeb437eb0985bfc32839

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