Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac6dcf1eb74fc2d…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 13:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: fd0e1409538f2af4f497c4c362bf1b98 SHA-1: 4b13d073d8983b1402e4b63740577287a158c5ab SHA-256: 6ac6dcf1eb74fc2d893b5b29e3439a77404df0e68469160b906246e723f672e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://nomylo.ru/uplcv?utm_term=label+matrix+2014+manual PDF link annotation
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/vulut.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa0304a2894---62090724273.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/b4c9e8def5d3bd429a65cad63ba6e61d/lupaxa.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a3f460f2a---xakoxelita.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774de09f5ad---44229120778.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/25380771188.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/bezufujikibojawen.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/7d353877e3b2dce73a80075f1a707a35/57713243071.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47d5999e52---98922347853.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/24742094604.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/22004805788.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/83808978170.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e429139ccf---jonanatorodofelodup.pdfIn PDF document text
    • http://bjjiffy.com/upload/19175958208.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/tipukariti.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608753aab8796---74013921578.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/10224714187.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/68039971799.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/xigeze.pdfIn PDF document text
    • https://sadex.pl/fck/file/70035110638.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160714733d8c79---dabem.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/5521986782.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/wozexuxemimegilulazulaxi.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/bowimimosogip.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/fezopexesunetadoxurarog.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/piwabibapu.pdfIn PDF document text
    • http://katachizu.com/img/news/files/fupadeza.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_off0000cb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB05 10652 bytes
SHA-256: 72d0f71ece4d00c9f4f0f2302df9bd3f51b4d8fdbb13ad6254ad05db2f34309f
font_01_sfnt_off0000e375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE375 17488 bytes
SHA-256: 8427c77944d36fa1d33c4e59ac2dfbf83845469f32396bcdbffa6902f0007e80
font_02_sfnt_off000110ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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