Malicious PDF — malware analysis report

Static analysis result for SHA-256 58282e361475969c…

MALICIOUS

PDF

97.1 KB Created: 2021-08-12 16:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2ee83afe993d4fcb4fdd8036742c6228 SHA-1: def36dc68ce7177925c1cf6450bd1b402c2e84c8 SHA-256: 58282e361475969c68b2b96c515216ce7ea005d9c8ac2271b240e2829a297202
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Internal Spearphishing T1204.002 Malicious Link

The PDF contains a link farm designed to redirect users to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' indicates an attempt to impersonate Coinbase, a cryptocurrency exchange, to solicit user credentials. The presence of multiple external URIs and the link farm structure suggest an effort to obscure the ultimate destination, likely a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=can+you+buy+and+sell+bitcoin+on+fidelity.
  • 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://aven.su/userfiles/file/firuzubokizizuzupukidose.pdf In PDF document text
    • http://uleshuzatshop.hu/files/file/terevoxidef.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/f26dc45e2ec40712f160289a98220161/rozefumolegotelutifewuno.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071cd95e86e3---54214771291.pdfIn PDF document text
    • https://dm288.rs/slicice/file/melaluvatonulan.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/wixoni.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac81b45f3---34234977844.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/raradebiduwovuziwutu.pdfIn PDF document text
    • http://whitebearlakeclassof1970.com/clients/0/05/05755deafc47004aae723e515cf08a6f/File/dabomu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d056c30105f---pulukowukawifi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b01813eb9b---62361980415.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6d2e8e2c05c63c003058888af4c1cdb5/68656764440.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085f0f9e3aea---99187092349.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/98184995510.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/18076114268.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/83fsrelnipaag1jjkjvq0tg5k5/92200908130.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/76615818429.pdfIn PDF document text
    • https://termofriz.rs//files/wefepeb.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/3aaebac1b6faee672d07d2bdcd9ccbc9/44152586861.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/jp7hnkj1sq7dq1ji4moq5ltms6/90784756662.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/zetutakivigezil.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaba2427328---boloxet.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/881438fc21a8d6a0e0d7b36e41b7432b/48210373317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=can+you+buy+and+sell+bitcoin+on+fidelityPDF 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_off000113e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E0 17820 bytes
SHA-256: 50572d2bae57320f16f84291e520d5abb486aa5a71f5b9bde80a6b5691a2caa0
font_01_sfnt_off000142eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B02 10752 bytes
SHA-256: 3c8e03c4df46a9759797ec6210f08c8b77d2062d6d26c5eb7e7b6a62120d23ef

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