Malicious PDF — malware analysis report

Static analysis result for SHA-256 190f8e7d01c242df…

MALICIOUS

PDF

105.1 KB Created: 2021-06-28 10:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1061dd202be8565546bd06f6001420c3 SHA-1: 98dcb51b510db5c8d87c6c21c0738cab13fa96e3 SHA-256: 190f8e7d01c242df6227e323c165729ae4a48d2eb465a70e046ea171861c3b23
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, some of which appear to be compromised CMS upload directories. The primary purpose seems to be directing users to external resources, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3ec8a60f7---65529546906.pdf In PDF document text
    • http://uptownherndon.com/uploads/files/91722035321.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/a6cbcej8iajcgpti5t3pida3q6/seramadurati.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c25255545b3---zikenimiziju.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d68962382f---gukefuwulimopijejofas.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/mapuzibalikoforo.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607863a84375a---zefipi.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a2c23bff4b8fe8d98ec79f2fd627bb5/juxixugejibusezujesudoz.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/bd4e2603ab6814d9f4ae1fbd837623d1/10437932007.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/935b4834cba96e631c7c908c30a0e151/jomeduk.pdfIn PDF document text
    • http://ropesadventure.com/d/files/lotarapib.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8db2faf2d3---kagutalodokibemolim.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/50093037467.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/46107207552.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609468903544d---68082775614.pdfIn PDF document text
    • https://tonitomov.com/picture/file/vosasulivilumuxutaluko.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/49722713129.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/97817854082.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/29937823c6b083cb1cf236cdfa020233/nibutomalawowolono.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac86d24a1cc---4543419307.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7078731a---bogikanilidobibisurirazu.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4eee10724b---jitelosotuzurogiri.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/a2ccb835e23266636debf330d94c078a/pawakaxavugun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=example+of+vertical+acquisitionPDF 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_off00013598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13598 18048 bytes
SHA-256: 86a6680c04cdfa8ed8b64a3fb09e0f77a3cf4f0f3730e6bba48d2051cabfa67e
font_01_sfnt_off00016561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16561 11040 bytes
SHA-256: 47663312b46846b35f87bdb8890be31adf17f5615ed46a82ef401e57f57bd5e4
font_02_sfnt_off00017f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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