Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1727b4873d60d2b…

MALICIOUS

PDF

91.2 KB Created: 2021-07-31 05:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f500444f9dab75569eb385f412bca1ba SHA-1: 1a2f08fdb3b9694a7dacb8db93f579b8cf573023 SHA-256: a1727b4873d60d2b7e7bb36bd340134c34400970d8113175c74b20a9db4e36ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains, likely to distribute further malicious content. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs suggest an attempt to trick users into downloading or accessing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/023867aa6bbd92a1dd9c6849361e6b80/jileto.pdf In PDF document text
    • http://pm-property.pl/userfiles/file/bibuxufamopajuki.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/9163185a044b46608bf2e028e05ec2d3/ribewizipujuduriwulenog.pdfIn PDF document text
    • http://beiks.info/public/file/60357060596.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/gowesiputomukoz.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/686323ce2979626b98c596c0d034a123/16209227825.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/70743121315.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dc1f4477b---29468123029.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e68f422da---rukimeluxerixag.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606da372cce7e---mugipegerozilo.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/padefi.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/kevevumeratuza.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/4f55602d6208b93f9032574dc0e566c9/falatato.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/sigaxenumasu.pdfIn PDF document text
    • http://shosholoza.de/file/tekexolo.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/70629416202.pdfIn PDF document text
    • http://cocoal.com/uploads/file/83163606482.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/38574731862.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d127cf01b7---suzuwegaxo.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/61362442492.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/dugifotazi.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/d5afamms48ep1o7ml7dh7tenq0/tisenafojatagefapizobutat.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210605_70FE844B2A3C03C8.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/jegokunavom.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fea993f1324---23325711835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=wordly+wise+3000+book+9+lesson+4+answer+key+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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 11360 bytes
SHA-256: 9884c16d8ebafc4d54d98188c886e40b856b1e31d202d88c51225941192e12cf
font_02_sfnt_off000126e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E7 1868 bytes
SHA-256: 576029c8d8d0730a74b9fb4c6f1c9ec25cf373647cebf47280bdb64bdffb7d2c
font_03_sfnt_off00012f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F82 17808 bytes
SHA-256: 90d88ef1d0fb1f95cde24aaf70f84db8d892e63c1b6cf07b142e3ba1e93df922