Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fe7cb55e5d3631…

MALICIOUS

PDF

91.6 KB Created: 2021-07-14 10:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2a557c596dbfe0a6f62b1fe5da64b33 SHA-1: 2335b044f7123bc6ba6b2adc2609994b79236413 SHA-256: 41fe7cb55e5d3631688ca0731ef8f4caf9e99fb66c411f118677991131b6f85e
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. The document employs social engineering tactics, specifically a 'ClickFix' lure, instructing the user to copy and paste commands into a terminal, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 9

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://abwingsva.com/uploads/files/dobiwewakujikikomixel.pdf In PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746bcfbd13f---lirulojutalirubikejo.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/64307685389.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f8dbd7539---99749144558.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be007271379---junofaxudumodoxenozedefa.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/99001702341.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/ae9534e9fcb7fc3469e0481420e73abd/25103170787.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/644d06c9b600e6794bb26efb92b3170b/78313670943.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/855f6abd6767e5598f988ab7d1d3abcd/48732707653.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/tikam.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/fivomibamaril.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/dutirekujuvavisixa.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/vu2e8s82qmagolho3j9n8hc1hr/78481621476.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/vebetitavoludufiziwuw.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/adbad0a94c07d894e6e39fe30156c0de/23402732669.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/77a7435c9d731bd2bf0837bb73682c23/84191834037.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/4fu0u9op5cafq7118jdfhnht4k/mopibofenonefoluzudesol.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/32851163691.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/zoxed.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/jikasuv.pdfIn PDF document text
    • https://12tiga.com/contents//files/44067746435.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/rorunul.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/omdqp3n0mh813ssjpgts3vnl7i/budimavaxaz.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/dupuzamuzebimikemol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=can+you+get+rid+of+the+activate+windows+watermarkPDF 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_off0000fbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11412 11368 bytes
SHA-256: 473cc24da1f396920c3657974324d04cadb1e7883bb8442686ec2f54e58a38b3
font_02_sfnt_off00012e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E91 19060 bytes
SHA-256: 0933722ecc042dd313520c008a09856200fcfe730fe1ea44d820338b9bfe1169

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