Malicious PDF — malware analysis report

Static analysis result for SHA-256 02851e625980c6f7…

MALICIOUS

PDF

83.7 KB Created: 2021-08-16 02:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee21b21ed44df0db4e667a991e7b748f SHA-1: d9ab52c0506557de26eca731faaec036fda985bf SHA-256: 02851e625980c6f729044475ff3a66dc5079f83cb4ad519c675b9fb4040b4813
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/uplcv?utm_term=biblia+ya+kiswahili+cha+kisasa+pdf PDF link annotation
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b739bb0f375---rifabudojofit.pdfIn PDF document text
    • http://ahchala.com/img/file/sumuraxuxabu.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/22391972852.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/d2c0k3iongqcku26o7linghlp3/kivemiboxedinomet.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/97469217773.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mixewolijelebijesajojob.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/raxokapugilotojinapiza.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/2781268490.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/22446060759.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f0e1f3324---15654431724.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6c0b982571fbd6cb591c51744859f356/navepurofexigam.pdfIn PDF document text
    • https://wagaskar.com/media/83332362911.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744cfbcd36c---73665440336.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/gihil7sv63acgno6e3ib7ulgdi/46300051664.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/mebaxadipudetumefugafage.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/gfiin2sfetf1vudsalu9e3dj76/bopibibututikalufeguvewo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1c31a4ff1---87954014238.pdfIn PDF document text
    • http://cecev.com/stockages/files/69657833006.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dcda511f2---zurijidubewisuvo.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/46514499771.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607775cd0fdcc---41615148722.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/68294999732.pdfIn PDF document text
    • 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_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 10648 bytes
SHA-256: 8fbcc88cf08726ca17296b24fa59ef1b36a827b0591a0f96f8599480a4f7c7b4
font_01_sfnt_off0000fbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 16992 bytes
SHA-256: 81bddb51e65181533de37d7f1cb235db033c75ce541ae96e999cb13ad8d6659f
font_02_sfnt_off0001284b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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