Malicious PDF — malware analysis report

Static analysis result for SHA-256 3959e3fe68a9309b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 15:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3033aa5a31b5247dc9dd169a46fc8a75 SHA-1: b8dcd74e4712ed02c1d4f474e6a664e75cbf9ac1 SHA-256: 3959e3fe68a9309b5959ff31ab7cc62a12333b528c4bddefdc1cbfc94b345034
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The primary URL, 'https://allytemp.ru/uplcv?utm_term=toyota+corolla+2014+user+manual+pdf', appears to be a lure for a user manual, likely a phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=toyota+corolla+2014+user+manual+pdf PDF link annotation
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f7267b3cd---99323685401.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6f537c931---85087480500.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/rugaserelonapegedakako.pdfIn PDF document text
    • http://intertravel.hu/_user/file/92741450850.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/21628688002.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315ef79e1f4---sunabifov.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bec1c7b60c---43932213426.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/nanimitofarup.pdfIn PDF document text
    • http://cochemical.com/upload/files/suroku.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aff840d860---92783969603.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/a132a8e059e73ba18cc3690ed9e0bea9/5708766933.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/korigobigigoxubomevujure.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160872e661cebf---30026554408.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/baxipud.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/hbgko5k5nhdum4v0lso045in60/48319743728.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/29740703909.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/nodozanojinipe.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/95820144241.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/0621854091864c3cedff4448d94606fc/zoxafakeverepusifigi.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087f8d1426dc---31409328051.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613497b3a8e3a---jazukoratisolaki.pdfIn PDF document text
    • https://reinigungsfee007.de/wp-content/plugins/super-forms/uploads/php/files/576rdho5vpsgp6buaaurbc8gda/mataxopudopizilijodoxer.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609654b3b4af8---28588675068.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7fbaac073---21381081148.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_off0000d97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 11240 bytes
SHA-256: 8afccd25e5ec8221156db7ece352170eedcb96315e0640caf7f5924ddeedd2e3
font_02_sfnt_off00010c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C17 17532 bytes
SHA-256: f90ea8a19f20faf79d0e75e1c9e2bb7bd4be12eecd8211a029e0d8b6a6b2f907

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