Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb881e9ca4ae2d5…

MALICIOUS

PDF

89.1 KB Created: 2021-06-29 06:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e43ec7dd0e9ae45973ba394a28f0706e SHA-1: b4eeb7e85cbf0182b0a121a705048aeb917445ec SHA-256: 9eb881e9ca4ae2d57494a017b8da8c0917677f5470f520b9b80a2b19a20c10f8
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or SEO manipulation scheme. The presence of multiple unknown URLs associated with compromised CMS uploads reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/5hdfu3ar5u4d60899ho546hkn0/54564798301.pdf In PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/k2abmpnj7hv1iktlp90uej38o7/59550616126.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/lajanidiwaxomomuw.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b35e18cd2e2e9dc4d2a1fdfce889b8c3/putuxujobixoromusedut.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf1046db2---winomikixovi.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/2e91f77e16666aeeabea26df0dab1cc0/65798594994.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/997487a6e2c54a8b41a319123e1ce137/70757416147.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/60801285244.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609485477f54a---mumegodaninenijojitub.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/337a567d4a4d1c70b38140de2b1990df/51953175436.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/p599qbtlnohbff3l04d71effhi/41999121579.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/dubm52hqmrqjj2idbf2iafnlr0/xuxumesutinuv.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/fodutufop.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/45777291547.pdfIn PDF document text
    • http://mhs69indians.com/clients/864804/File/kifovevotipum.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c7c72f29---49985957457.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32ab045b9d---68091053309.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f1bc9b6ca---53938975489.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cad5be33d---35352327578.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608beb048e681---rosowu.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/mjlevjgkrnq4pvee6evgh8tngd/netabepuk.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d098cf4154---mirabadixovut.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/36701206624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=joint+rollers+hand+bookPDF 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_off0000e007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE007 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_01_sfnt_off0000f57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 18956 bytes
SHA-256: a8a1f5100be7039b3d08b576b05f4bb030a85c6fbe0c081d117222949e6402d3
font_02_sfnt_off000126cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CD 10568 bytes
SHA-256: 57e54edf16dd24f68f511108486fe33bc9d1d06aaa6b9af5a6dad61bcbae39a8
font_03_sfnt_off00013ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1