Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef7feb677ffb868…

MALICIOUS

PDF

85.5 KB Created: 2021-09-21 11:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1fa1ce725be4a32fc7bc0365ce13b2b0 SHA-1: b93c3f24920f9daa0be86be92768981f60a157bc SHA-256: 4ef7feb677ffb86894fbf22a9d4583ecb99cfc045fd6bc289b212f8113417a3c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to potentially compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a scam, by directing users to external URLs. The presence of embedded JavaScript suggests it may be used to further obfuscate the malicious links or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=wifi+and+data+not+working+android PDF link annotation
    • https://corpeverest.com/ckfinder/userfiles/files/49974261424.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/45891892395.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bexeboso.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/44137805112.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210917_77D4020D98E32E08.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/79479565835.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/gasiwumuxakozarim.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/xagazipowerukogu.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/74dj353jephamm5v74q7ac5ddk/85984118929.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/befepolikevet.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5f70ed14b---80851455839.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/memamipunixupeguxe.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/19345236022.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b9f04a98f2b70b910e015c862774a7e7/mipefako.pdfIn PDF document text
    • http://adice-area.com/pictures/files/zirunixudutefukigow.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/21160440331.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2dcc0460---8158261759.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a32af5aee5---latupepaxesewuragatutijes.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/wibuledamopogozexakofu.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/7639524986.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/gitexaxivujewiwu.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109162026519570.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/15836862246.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_off0000e5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE07 10356 bytes
SHA-256: 3d95458cdc4c17ee5659584c89197cf1751fbaa1b95833399d938d4c264f6e8f
font_02_sfnt_off00011559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11559 19660 bytes
SHA-256: 975582030dac80c4c4c73b2ec841af4278066b00029fa290121ee6e4f207a388

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