Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b6e7907fc702da…

MALICIOUS

PDF

102.2 KB Created: 2021-06-30 21:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7bd384e461a38d55c28126c8c8ec284a SHA-1: fb9d221c942502160fefb360d0db2815f882ee42 SHA-256: 88b6e7907fc702dac8b479cad3368b0b824369f865e100b4d885db2ffca375e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, directing users to multiple compromised websites, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/53f1d0b54fbba0a3d1626e7d1178397c/44764675832.pdf In PDF document text
    • http://playbabydoll.com/userfiles/file/27475062896.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4e33c1934d73eb6c60ed8153e04e8be3/tiwuselixatusigop.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/rozagaxulenedu.pdfIn PDF document text
    • http://dnepropress.net/files/file/38012060451.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/d83eece9ab54dcb4a46493d81b84224f/49513986655.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/66b837fa20cb78aa6b77271377a691c3/xaxuxajelamawotonenotus.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607498d5a6c6b---37817857215.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d57586030c8---58042108496.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/palodafulufu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/4d37118650264ffbb092fddc5c6b1684/14804428464.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4720ad0c8d---47503388546.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb01100635c---41434233892.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/n6h0uvev6jssdmll8ul636a0v0/1815642237.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/bf683edea26f1fdb6cc873ff8305120c/muxozatupa.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/31146442556.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/10027371345.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa531ba960---zurowuzu.pdfIn PDF document text
    • https://olterus.info/contents//files/59900886229.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/gakaj.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/pozebofaxefikitomabedejo.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/71439274856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=direct+fuel+injectionPDF 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_off00012c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C61 10232 bytes
SHA-256: 0759606e871290774bec51d46f5c386fd19ba17340d6e1ce3c6a44a001202d64
font_01_sfnt_off0001436b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436B 18784 bytes
SHA-256: a06078120f224e84ebdbd15eb03dc9dbc8abac1b4f28fba874b25212b22ac571
font_02_sfnt_off000173dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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