Malicious PDF — malware analysis report

Static analysis result for SHA-256 4058af631ae8e7e6…

MALICIOUS

PDF

81.5 KB Created: 2021-08-21 04:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4dbb317c62df196c160bf2ace687a78e SHA-1: e494d61f89cba8b6ebfe1f8ec289aca337bd3dcd SHA-256: 4058af631ae8e7e6b05834ada575f9b6370e639100bc5a71ca46b9394ae21063
236 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan. The heuristics indicate it uses social engineering tactics, specifically a 'ClickFix' lure, to trick users into executing commands via the Run dialog or a terminal. This suggests an attempt to bypass security measures and execute a secondary payload. The document body is heavily obfuscated and unreadable, but the presence of numerous links to potentially compromised CMS upload directories and disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://nirmalamathachurch.org/cms_uploads/image/file/11784606264.pdf In PDF document text
    • http://kool-house.com/upload/editor/file/gakekeremasupux.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/malebotujodufuzogu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9cdfef56d2b7893cbde7e72408027940/22191782833.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/27bb272d7464f269317e91679186217e/xurigegi.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/25396360784.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/m94g6anp1urrrapa62ie4gouht/pekake.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/kamaludofemawonotem.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/pfagufrn5ahenr3a6b52mailsq/dalotalizaxur.pdfIn PDF document text
    • http://com123.vn/uploads/file/61604539164.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/riseluxitixokifefifeb.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/xabolibalagoxotino.pdfIn PDF document text
    • https://banghenails.com/upload/file/pikavokukufawowamame.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/15542171514.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5da71dcebf1218a4c7657dcefcf19aa3/gamuxijuxume.pdfIn PDF document text
    • https://abeess.com/userfiles/file/sijalelavodenaja.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/84154385050.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e242abb141---81362460530.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/34ab77cd72f9db40a631a9895994aae7/30718007807.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/birusaxanikeredu.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/5a77aba6639c4e519761b1f2fe621522/senajimimilonetedonedapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+make+bootable+pendrive+using+terminal+in+ubuntuPDF 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_off0000db34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB34 11208 bytes
SHA-256: 2e9869416c2433c7d26f453ce0b3b115d4c4dd01cd2506d567a9b655492a6e06
font_01_sfnt_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 16576 bytes
SHA-256: 7dc815c09ba3d9fd945f2bd1e596c56c1b35053dae22f53ae805397a180956c2
font_02_sfnt_off00011fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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