Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c324a82f44a1f5…

MALICIOUS

PDF

138.6 KB Created: 2021-09-03 00:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c4f28dc3232d38dcb9b5dd2096a4a567 SHA-1: 931bdb4645c41b871d20fce3b92d1bcc96e0c3bc SHA-256: 23c324a82f44a1f58ad26016c5131632307708fec58f112c37273713c256b2d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9966

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://lnshiyue.com/userfiles/file/20210525143730_77485924.pdf In PDF document text
    • https://vietrocknet.org/app/webroot/img/files/numukupuludujamizaso.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/52321529.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160915e779ada0---31836627636.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/93181729156.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/33052325000.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/95759344594.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/57590735771.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/dcvbogmn9neg7gsjrt7654q50p/15050423555.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/245f4vjiclhhkuo9gmeak9m08s/zunegog.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/4378694054.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/sanot.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/g1cte68390c2i28l8fcvpevmpd/39451415216.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/52535993606.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/kisepelaranusag.pdfIn PDF document text
    • http://rapet.hu/files/71411258377.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/pn6ab9j30gja2cm4a1g1hlgal7/27352781386.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/67851647831.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/67749821797.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///86912908323.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f071aa187---jeritixituwigi.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/rawozumuneb.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/34095543193.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/xivisuxowazuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=dominikanische+republik+reisef%C3%BChrer+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ab94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB94 24244 bytes
SHA-256: 99f6c7fc08c96fedd639dbf0c40a62b582be3b612a148f30c88bfab9ab267d3b
font_01_sfnt_off0001e854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E854 11312 bytes
SHA-256: 0d582d30c1e977cc7e913455fa4b001175fd38d8bab2dbf00aaa3f4b531cf56a
font_02_sfnt_off0002021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2021B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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