Malicious PDF — malware analysis report

Static analysis result for SHA-256 5257b0fbd561a57c…

MALICIOUS

PDF

117.5 KB Created: 2021-07-24 06:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7b8e48b251f2748aef0ec1c830a2c89 SHA-1: 063fb98d359743a515466c924e8144ca1394a3b6 SHA-256: 5257b0fbd561a57c21f5b8421e9bf35ce006fc7410a872655e74f555bfa1fd52
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of external URIs and link farms suggests an attempt to direct users away from the initial document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 http://tuvanthanhlapcongty.biz/upload/ck/files/rosarezobanoguzibisemolog.pdf In PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f9b5d7364fc---89957679969.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c84183094---63792808723.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/24350870989.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a37151ef81f---dujakox.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160823c9e3b860---97243103698.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d2d7da6669---pobuvenenuzixapegota.pdfIn PDF document text
    • http://metallpress.ru/files/tojatuposipekazasorog.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/34141067132.pdfIn PDF document text
    • http://benrassam.com/uploads/files/mivomigokawimokovimonizi.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607241abc3de6---43179088358.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/24544558458.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05117be2df---29042661546.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d89bac26e---dedanonokavuxodebajekupax.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/um8sp5f7ur2urchs4sdl0vmjvr/xamanafito.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7f309b725---41680112259.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/kavakedojabavisutub.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ikpe4vkvrvl7tjbvir179f1185/74327122569.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dbb00fc14---10621053446.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bba82ca027---20451268547.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/660cf79ea2003f5f161585ecfc16b70b/tubowalejifufajinen.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089077bd9211---48847732795.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1623991435.pdfIn PDF document text
    • http://broeinest.org/ckfinder/userfiles/files/pebejutivewedavatinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+calculate+distance+between+deck+spindlesPDF 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_off00016bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BC2 10816 bytes
SHA-256: 95550a1d02559d4c1b877c27c8021da1c9b7902c06a275b34a7d12b44da889c7
font_01_sfnt_off00018496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18496 16276 bytes
SHA-256: c2e768d9578988e9a731ebdcb420c53fae389ae3298040b43b13a03053295041
font_02_sfnt_off0001aebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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