PDF malware analysis — malicious · 27537e7eb55b4fd0

MALICIOUS

PDF

81.7 KB Created: 2021-07-29 10:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 67fa0621fff870e8c475530b51514b32 SHA-1: a780bf829cde22b8366b6b254dd83489bc98fbd1 SHA-256: 27537e7eb55b4fd08b1cdeefc3e90c4e888bb97a0fe8181ea6ef8d26795ec3ff

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised WordPress sites, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were directly extracted, the presence of numerous URLs pointing to potentially malicious PDF files suggests a downloader or dropper functionality.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/10a96f911398edaaceb9d5fb45c64e77/fisixe.pdf In PDF document text
- http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad16b601115---1326083004.pdfIn PDF document text
- http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb4447fa1a---94449186273.pdfIn PDF document text
- https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/60b8379a3ce847d86dc9c6e7e8597b8f/99427887258.pdfIn PDF document text
- https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de42ace50b8---3892997580.pdfIn PDF document text
- https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/f96232a0168f4bd4f2c8017325e837e1/15696687455.pdfIn PDF document text
- https://remoteyourstaff.com/calisma2/files/uploads/gojiradogozaxafakujaj.pdfIn PDF document text
- http://mqskin.com/luutru/files/godamogetumotifozilemu.pdfIn PDF document text
- http://limeitec.com/upfiles/editor/files/komaf.pdfIn PDF document text
- https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae14cd3893---gomusozitetarefeg.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f4e7bce7---12174406484.pdfIn PDF document text
- https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/94ec5496fa76a3e9d549103b3f83c6f3/60271386176.pdfIn PDF document text
- http://ahkkpcm.org/userfiles/33935967156.pdfIn PDF document text
- http://perlawarmii.pl/userfiles/file/zenupuk.pdfIn PDF document text
- https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/tia2t0vevj6l38qef4h9af6697/44749143971.pdfIn PDF document text
- http://www.jindatunnel.com/up_files/file/tevunapibeva.pdfIn PDF document text
- https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/5f83ff578a22f3bd32e1b65623fbccba/49039954180.pdfIn PDF document text
- http://flooroverstock.com/admin/userfiles/file/dujazapopazuwivo.pdfIn PDF document text
- https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/j1fmoosv40puviv4vjcm7mgopu/maletexerigepituv.pdfIn PDF document text
- https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083842aa1c15---wunuvu.pdfIn PDF document text
- https://oxfordjsr.com/userfiles/file/4474686365.pdfIn PDF document text
- https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ajo8mf3vm784q0n0htpa17vbnr/dawonigelobizegavune.pdfIn PDF document text
- http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/xoxurukexowixopexov.pdfIn PDF document text
- https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/l1hdhuork0pob609hj9ec0sr1d/1757607705.pdfIn PDF document text
- https://tailormade-sales-marketing.com/userfiles/file/buzuwixefifuz.pdfIn PDF document text
- https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/bcaad4081c217c56752469d2fe76f559/13839852442.pdfIn PDF document text
- http://zeguvietnam.com/uploads/ckfinder/files/24766392249.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cisco+anyconnect+secure+mobility+client+windows+storePDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000db25.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB25	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f337.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF337	16676 bytes
SHA-256: `72d031a23e611905e1d1378d7a44ac79162e621268461c04096abd27abb78eb1`
`font_02_sfnt_off00011ebb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EBB	11000 bytes
SHA-256: `457f14b0da5b9947b467a94d464c81ea393205b721393042f456ff3b0c614e95`

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