Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcec538602c64b6e…

MALICIOUS

PDF

71.1 KB Created: 2021-09-04 12:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38b11f76c32d786ef0bebe99d26fc0d2 SHA-1: be820938b17a063ffd2d2415e67538b0912594dc SHA-256: bcec538602c64b6ed1b548158e7d89b609928989887c60b719bbda13bd9aa471
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://alakharia.com/public_html/userfiles/file/wokurosifefitopa.pdf In PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7d89a1f716cf44bbee7065309f90b6de/tezugozevibolarotab.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16202925703978.pdfIn PDF document text
    • http://hainfelderteich.at/sumevijot.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/judamatulow.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/fevisuxijibosepetoku.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/xovotegelonoxulaw.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/7bd581f23160c2ab8680877a64784cec/tidudakibizis.pdfIn PDF document text
    • https://12waktu.com/contents//files/jupitedefidukitobitifide.pdfIn PDF document text
    • http://stillwaterponies83.com/clients/74660/File/naseworamisujulezuvaze.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/voxepilosa.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/d76317cb06d17438b6bdcc28d40410ef/7837624715.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202108310205542796.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/0c4nllh45qd7qpu63on0amqk53/507183511.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/tovilazep.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/89126652903.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/farofukepu.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b22b37e0420ed7af6dc49ea424b5316a/26773814724.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160905d52e6b28---49161729565.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/345051a25a65427786b94fd08912b465/tisupufodukikawulov.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-16/20210816215837381220.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/17070555135.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/35110725866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pattern+recognition+test+pdfPDF 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_off0000b51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51A 16416 bytes
SHA-256: 10aed1b36f7f9135bf8d38c0b31bdcaa25bcda8a17616fe76e0655b48a20862e
font_01_sfnt_off0000de9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 10752 bytes
SHA-256: 4c03f528fc2b850093fb1712a6736127f80e0538816a751489e0543f44732476

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