Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f6357faf1c7967…

MALICIOUS

PDF

71.8 KB Created: 2021-09-06 03:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 9afb79891b15441ca4d0a706826a2c56 SHA-1: 42bbc92fc8255f026a1f32b1e55b6f163e863b39 SHA-256: a7f6357faf1c7967a5b486eb5c3b4173dd28fc7c34c85ec7605c85f8a9d49857
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 0.9975

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://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/5647417383.pdf In PDF document text
    • http://envigest.cz/upload/file/xupubumig.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f60a50dd783---50021497321.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16105acd223971---44046027706.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160726bd3eb4fd---sabimoxoriwa.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/zonutab.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/8ceaf4f6153c7a788d909e62d23a7dce/jujenekanev.pdfIn PDF document text
    • http://bwc.lt/i/luzivovev.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/tidubabal.pdfIn PDF document text
    • http://ktcz.eu/files/files/9848499605.pdfIn PDF document text
    • http://meadclassof1991.com/clients/c/cc/cc689d7a74a098ef67b43942063c7ff9/File/45667660884.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210807162929.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c4e1401d2---gawurutidulugozop.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/ruxuberituzajizu.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a82579cab3---vasifuduvopose.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/mozupuvad.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/dazun.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/tsnu1a9c62eane53t7vkv3c4m8/fixedabogefozanojajo.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/nudafujinorikigu.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/wuvofuxizemugufej.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160947d7d83a8d---pokenajujariteboxorowiget.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/12202561792.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092663ed9db4---tasogitofurukiwubojag.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/34670328494.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160769bb7d56de---81482837265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=regulation+of+rna+processing+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA29 14904 bytes
SHA-256: 6428cbd07a025912df98d3e3986e0eecc0cfacdf9f8c7b98c1cfcc3ec2c267eb
font_01_sfnt_off0000dfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 10940 bytes
SHA-256: e32e99bb6e259931e23af7368eb666ab10a2635b67729679a50298eb60938a96
font_02_sfnt_off0000f92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1