Malicious PDF — malware analysis report

Static analysis result for SHA-256 86aac5c2f7b59c64…

MALICIOUS

PDF

77.5 KB Created: 2021-08-27 12:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8eb32581630c3cc26330798a4e5a8949 SHA-1: 562de1b192d92ec2411eb25d0945093a1b8a1812 SHA-256: 86aac5c2f7b59c646a7c4f4ad4aa285065eaa8f86dc71887d980e271af32162c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to external resources. Several of these URLs lead to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or host phishing pages. The PDF itself does not contain readable content, but its structure and the nature of the linked URLs indicate a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://seikico.net/img-tym/files/sofoborudekubor.pdf In PDF document text
    • http://tlxzkj.com/uploads/file/170554406685.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f85fc79e4---tazepadojiramofejone.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a7da7c546ab21af04a5560b7a3ab9a34/82465506824.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48275d4d17---74379707353.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ejaeurrv7nps95lte17sv3puu6/42527425600.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/55236570062.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/retelotizarirunoj.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/6ba56d95a74242282e77391266877b11/pidex.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/89529471233.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/5cca44c0e20569f288cb111143bd7180/toxokob.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24569612739.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7dcdc6c1e---59744977676.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/alfa0cbjpjl5nc8fdlkstb9bv5/33170585761.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/52c05c30aa04771b1f170e4118e99dc2/kupukexetejuxividamefi.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/jodofut.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/da902c50d44f7d82c54e14cf88147159/ronodobezi.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/23970095089.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/68412641327.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/narinebofuroduzoze.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/supusebepezopazobujunedo.pdfIn PDF document text
    • http://cooleywestbrook.com/clients/865832/File/51040133714.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/79978392791.pdfIn PDF document text
    • http://wwstationery.com/files/file/35060408048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+mystery+of+utmost+happinessPDF 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_off0000ccba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBA 10752 bytes
SHA-256: 7b9363ca629d37458571ac691fa58b7ed2d820ad2ba85aadcb19c76bac1421b6
font_01_sfnt_off0000e555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 16548 bytes
SHA-256: 529be4130cded91b0384335eac2f45e7c19eb18d568b74a539275326bee50da6

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