Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5552801d00d004…

MALICIOUS

PDF

78.1 KB Created: 2021-09-03 14:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 02a5086f40c04e1a18ff2029c01f030a SHA-1: a235fddf42afc1e81194e46eead2b15f0319a5ff SHA-256: fe5552801d00d004422e1dfe70aa713e4602380d5c609991735040750a8ef929
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm or phishing campaign. The presence of these links indicates an attempt to redirect users to potentially harmful content or facilitate further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a61025296---votugile.pdf In PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/067b1fb8964dcddc46412448c13a533d/zixofuzazowajidogexobabu.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/2e8a104ffc2f221d90ba91d1d701202b/nizabazomuzimo.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/011261fe855ad5c93b1208c3aa26632a/pugadesij.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610b0afa9b7ad---38907823051.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/41d9c127ed1801ecade5d93fc1193029/tefum.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/63501956834.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/55828430242.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9991d3191---sodutavutokowokasogobix.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/3bf8ab470450faeb63000723e7149d3d/towol.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3669fea167---21395702898.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/domivanewamilew.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/jinag.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210428034632161.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/30677171647.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/37b6a2115ca1fe4730aa8a5c9d02a834/38673611741.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/figutajijibumowubuv.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/ribuduzonekezidigikibe.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad380e734a4---66742170697.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/jusarisuduxevabozonano.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078820745b84---bevebalok.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///76681294494.pdfIn PDF document text
    • https://phm.vn/upload/files/47004327364.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df0ddc42233---jonefokojeroxefafifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=once+and+for+all+newsies+sheet+music+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_off0000cc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9D 17080 bytes
SHA-256: 81d6704ae7cc5d583c9feb6c7c75544bb6fc7ca17198b57cfb71f441f6b7e64a
font_01_sfnt_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 11096 bytes
SHA-256: 37306be1e6f1922e531829f1fb31d0b0a63cbb37b531afc2fdd17efc2d7f5ced
font_02_sfnt_off000112a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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