Malicious PDF — malware analysis report

Static analysis result for SHA-256 689f2cd59dc8d866…

MALICIOUS

PDF

88.0 KB Created: 2021-08-20 02:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 106abd3881fc80da748e58e03404deac SHA-1: 08e9aec91ff4983b2e3ef2b13af44f4cea774b8e SHA-256: 689f2cd59dc8d866f4d09aa857279ef60839948aa852b4e25629b8cad862b8b1
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160972103e1317---9448124600.pdf In PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/25ba977133bc36c09336416366522d5d/81471508309.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/78296557693.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/922872aaf22aa88bda19000f53cd843a/nesunajupukuwabipixomido.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/wolelaju.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/10365231620.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ede96f16891---kixugobixe.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/74753154253.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/powox.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e5ebbe34e4---nadutij.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/vevolupozomopevoregaboz.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/netejojamozuzukesiwadoxak.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/kg3tjc5s8o8ks19oou7cv4f59o/65393891696.pdfIn PDF document text
    • http://tochuchoinghi.org/files/84171080898.pdfIn PDF document text
    • http://labonscafe.com/userfiles/rosixavavixuzasedewaxim.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d2a25882---9344506811.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/86783165973.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/77480952698.pdfIn PDF document text
    • http://zerosquareonline.com/file/kolomifabezinepivunan.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a445f135c58---88153151887.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/90069262570.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/9n2erofpv573kg0gf0mtsbmf2c/52888088164.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/dolesazomojidijavorukan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=logic+and+computer+design+fundamentals+4th+edition+solution+manual+free+downloadPDF 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
stream_006_off00011e28.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11E28 17348 bytes
SHA-256: 9a5f685e72648859f02ff52e1aa745eb79b98181abee8f2a2418062b58e01e6b
font_00_sfnt_off0000d673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 17276 bytes
SHA-256: 9dab95a33b11fb0a98657f66771b25a151a4932ba5f5bb5a524bbd99fed1eb97
font_01_sfnt_off000103f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F1 11288 bytes
SHA-256: 949b37f30135e94e4524d3571261f9f613d4802ae2c0ee4e0ac9200142120ea0
font_03_sfnt_off00013854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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