Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8f95a883ad7995…

MALICIOUS

PDF

89.4 KB Created: 2021-06-25 18:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2b4b01f0922fb3b9c0b5dbe30bd70ac SHA-1: bab3bca196022e9d2146ed69a76ff59287dc868d SHA-256: dd8f95a883ad7995112471eca582f8e2823124b4fe6b81131c58e943abef5d25
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and other disposable hosting sites. These links likely serve to redirect users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xiaohecollege.com/d/files/likejigekewuroxovofedep.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/5ddaf2af34cb521516b69330b503d240/17652501562.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/c5dfb0db54436bad09f89be35e6c6eae/wotivosuj.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5b839716b---tutojidederusolasizez.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcc7ade304---rabonivedelu.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/tr15ko73qgau2mt04snudicb68/15973416355.pdf
    • https://rybczewice.pl/userfiles/file/kenebasutizowi.pdf
    • http://dashoernerboot.de/userfiles/patapamitewisubobus.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4af96cbaf43f4b3eb4ddf711cb5ec6da/46461952090.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/68d00c4d915e8f0d87d6fd397f0d4163/rifunulusiwuvimuju.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee18022517---suterugawovut.pdf
    • http://monkey-do.net/userfiles/file/kozimujubusefasuduka.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/0bc7581991238c50983c13a5462595a6/52033063698.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1a87bdd9f---kitukudexekejisopugu.pdf
    • https://tecnibat.net/uploads/archivos/91444899650.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be7427b59b0---11486519742.pdf
    • https://yarpaket.ru/userfiles/file/99421241655.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ql6mku31084jbn1q86q4ake18l/96263017215.pdf
    • http://stark-tools.ru/images/uploaded/29665822924.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/dtpmpd7bd1morb7atetf54t7ca/ripubovote.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/982bbcacea39e949e5b127b24c72603c/gabowusakawonuv.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/9hfrc944rgj1imll4532omcpdt/xobesodijivos.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a997142a298---suvijubasoviwowudanet.pdf
    • http://esthebel.de/userfiles/file/wagodilodetezufidemaved.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=for+you+homestay
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e916.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 16792 bytes
font_01_sfnt_off0001012d.bin
81c3d817b5cc1b8185415087e65b06da0b0c4ceac833d6593730c3e7791a43e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 10320 bytes
font_02_sfnt_off0001188a.bin
2f8aa1f54d825d180198c79768f370113d72ca4dccefc2de591f3d0a016a2ef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1188A 31792 bytes

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